c Colored Gemstones Enhancements
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Common Treatments of Ross-Simons' Colored Gemstones

11.90 ct. t.w. Multi-Stone Bouquet Ring With Diamond Accents

Almost all colored gemstones sold by jewelers today are enhanced. Many of the processes have been used for hundreds of years and are accepted by the American Gem Trade Association. Colored gemstones without treatment are rare and incredibly expensive.

When it comes to treated gemstones, Ross-Simons only accepts the treatments that we feel give our customers a high-quality gemstone at the very best value. Our gemologists thoroughly inspect our gemstones to ensure our high standards.

At Ross-Simons, white diamonds are never treated or enhanced. However, all of our colored diamonds have been treated unless described as "natural."

Here are descriptions for the common treatments of our colored gemstones:

Bleaching: This process lightens a gemstone through heat or chemicals.

Coating: This process coats the gemstone's exterior with oil, wax or resin enhance the gemstone's surface, protect it, give it a special effect, or make it more durable.

Dyeing: This process adds a coloring agent into a gemstone to change its color, improve uniformity, or enhance its current color.

Filling: This process improves a gemstone's appearance and clarity by adding glass or another agent.

Heating: This process uses intense heat to change or enhance a gemstone's color or clarity.

Impregnation: This process introduces resin, oil, plastic, polymer, colorless wax or other hardening agents into the gemstone to increase its durability or enhance its appearance.

Irradiation: This process uses radiation to change a gemstone's color. A heating process commonly follows the irradiation.

Oiling: This process improves a gemstone's appearance with the application of a colorless wax, oil or paraffin.

Reconstituted: Reconstitution is a process that involves molding ground-up natural gemstone into a solid stone with the use of a binding agent.

Stabilized: "Stabilized" means that the gemstone has been treated with a clear epoxy, resin, or hardening agent in order to protect its color and prevent it from fracturing.

Ross-Simons Gemstone Treatment Guide
Gemstone TypeRoss-Simons' Gemstone Treatment MethodsCare Advice
Abalone shellDyeing, coating for protection, stabilizing to reduce porosityWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaner or steamer. Avoid sudden temperature changes, rough wear, heat, chemicals, and acids. Avoid perfumes and hairsprays and be mindful of scratching.
AgateDyeing, bleaching, heatingWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually okay to use Avoid high heat.
AlabasterDyeing, heating to imitate the appearance of marble or induce porosity for dyeing, and bleaching to remove dark stainsWarm soapy water and a soft cloth are safe. Hard bristle brushes may leave scratches. Refrain from using ultrasonic cleaners and steamers. Avoid rough handling, high heat, and prolonged exposure to strong light.
AlexandriteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually okay to use.
AmazoniteImpregnating with a colorless wax, paraffin or oil to improve appearance Warm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners, steamers, and chemicals.
AmberHeating in oil to clarify cloudy amber, heating (sometimes with oil) to produce disk-like fractures creating sun-spangled amber, heating to darken light amber, and dyeing Warm soapy water and a soft cloth are safe. Hard bristle brushes may leave scratches. Avoid ultrasonic cleaners and steamers.
AmethystAlmost all are heated to improve appearance or deepen colorWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually okay to use. Avoid steamers. Do not expose to intense heat.
AmetrineHeatingWarm soapy water and a soft cloth are safe, ultrasonic is usually safe. Avoid the steamer. Do not expose to intense heat.
AmmoliteLacquer coatingWarm soapy water and a soft cloth are safe. A hard bristle brush may leave scratches on lacquered material. Avoid ultrasonic cleaners, steamers, and solvents.
AndalusiteHeating (rarely) to produce pink color from some greenWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe. Avoid steamers.
ApatiteNo commercial treatments known Warm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners and steamers.
AquamarineHeatingWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are safe if no liquid inclusions or feathers are present.
AventurineHeating, dyeing, and bleachingWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners, steamers, abrasives, solvents, and heat.
AzuriteImpregnating with paraffin or epoxy resin to improve polish and hide small cracksCool soapy water and a soft cloth are safe but do not over clean. Never use ultrasonic cleaners or steamers. Avoid heat and solvents.
BakeliteMan-madeA soft, dry cloth is safe.
BerylHeating, irradiating (see varieties for varietal specific information)Warm soapy water and a soft cloth are safe. Avoid strong detergents and high heat (see varieties for varietal specific information).
BloodstoneDyeing, heatingWarm soapy water is safe. Ultrasonic cleaners and steamers are usually safe. Avoid high heat.
BoneOrganicA soft dry cloth is safe. Never use ultrasonic cleaners or steamers. Do not leave in direct sunlight for long periods or expose to extreme temperatures. Store in a dry place. Porosity may cause it to attract and absorb daily products and moisture which may lead to skin irritations.
BronziteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers.
CalciteDyeing, paraffin or plastic infusion, irradiationCool soapy water is usually safe. Avoid water with low PH acidic nature. Never use ultrasonic cleaners or steamers. Avoid solvents, heat, and prolonged exposure to strong light.
CarnelianDyeing, heatingWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually safe. Avoid high heat.
ChalcedonyDyeing, heatingWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually safe. Avoid high heat.
CharoiteNo commercial treatments knownWarm soapy water is safe. Avoid ultrasonic cleaners and steamers. Avoid rough handling.
ChrysoberylNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually safe. Avoid steamer if the stone has hairline fractures.
ChrysocollaNo commercial treatments knownCool soapy water and a soft cloth are safe. Avoid ultrasonic cleaners and steamers. Avoid high heat.
ChrysopraseDyeingWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually safe. Avoid high heat.
CinnabarNo commercial treatments knownCool soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers.
CitrineHeatingWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe. Avoid steamers. Do not expose to intense heat.
CoralBleaching, dyeingWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners and steamers. Avoid high heat and chemicals.
CorundumDyeingWarm soapy water and a soft cloth are safe. Avoid chemicals, heat, and ultrasonic cleaners.
CrystalMan-madeWarm soapy water and a soft cloth are safe.
Cubic zirconiaLab created. No commercial treatments knownWarm soapy water, soft cloth, ultrasonic cleaners, and steamers are all safe.
DiamondDiamonds in the D-Z color range are typically untreated. Fancy colored diamonds are usually irradiated and heated to enhance color.Warm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually safe unless the diamond contains feathers.
DiopsideNo commercial treatments knownWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners and steamers. Avoid intense heat and rough handling.
DruzyDyeing to enhance appearance, sometimes coating to create iridescenceWarm soapy water and a soft cloth are safe. Avoid strong detergents and extreme heat.
EmeraldImpregnating with oil, wax, or resin to improve appearance. Dying with color agents.Soft, damp cloth is safe. Avoid ultrasonic cleaner, steamers, strong detergents, household chemicals, cosmetics, hair spray, and perfume. Refrain from sudden temperature changes.
EudialyteNo commercial treatments knownCool soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Be mindful of scratching.
FeldsparWax infusingWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners and steamers.
FluoriteHeating, irradiatingWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners , steamers, and heat.
GarnetNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe. Avoid steamers and sudden temperature changes.
GlassMan-madeWarm soapy water and a soft cloth are safe.
GoldstoneMan-madeWarm soapy water and a soft cloth are safe.
HematiteNo commercial treatments knownWarm soapy water, a soft cloth, ultrasonic cleaners, and steamers are all safe.
HemimorphiteNo commercial treatments knownCool soapy water and a soft cloth are safe. Avoid ultrasonic cleaners, steamers, rough handling, heat, and chemicals.
HessoniteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe (unless liquid inclusions are present). Avoid steamers and abrupt temperature changes.
HowliteDyeingWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners, steamers, rough handling, solvents, and extreme heat.
HyperstheneNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers.
IdocraseNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid rough handling, heat, and hydrochloric acid.
IoliteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid abrupt changes in heat.
IvoryBleaching, dyeingWarm soapy water, a soft cloth, or cloth dampened in methylated spirits are safe. Avoid ultrasonic cleaners, steamers, rough wear, heat, and solvents.
JadeDyeing or heating to enhance color. Impregnating with paraffin wax to hide surface cracks.Warm soapy water, a soft cloth, ultrasonic cleaners, and steamers are all safe. Avoid high heat and chemicals.
JasperDyeing, heatingWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually okay to use. Avoid high heat.
JetNo commercial treatments knownWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners, steamers, rough wear, heat, and chemicals.
KunziteIrradiation, heatingWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners, steamers, rough handling, and abrupt temperature changes. Prolonged exposure to light, particularly UV and sunlight, will cause fading.
KyaniteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid rough handling.
LabradoriteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid rough handling and heat.
Lapis LazuliImpregnating with colorless wax and/or dyeing to enhance colorWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid heat and solvents.
LarimarStabilizing to increase durability and improve appearanceWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid rough handling, heat, and chemicals.
MagnesiteDyeing and stabilizingCool soapy water and a soft cloth are safe. Avoid ultrasonic cleaners, steamers, heat, and chemicals.
MalachiteDyeing, coating with colorless wax, or impregnating with paraffin or epoxy resin to improve polish and hide small cracksWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid rough handling, heat, and chemicals.
MarbleDyeing, lacquering to improve appearance and durabilityWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid harsh chemicals and vinegar.
MarcasiteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid acids or chemicals.
MelaniteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually okay to use. Avoid steamers and abrupt temperature changes.
MoissaniteLab createdWarm soapy water and soft cloth are safe. Ultrasonic cleaners and steamers are usually safe.
MoldativeNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually okay to use. Avoid steamers.
MoonstoneNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid rough handling and heat.
MorganiteHeating, irradiatingWarm soapy water and a soft cloth are safe. Avoid strong detergents and high heat.
Mother of PearlDyeing, coating for protection, stabilizing to reduce porosityWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid sudden temperature changes, rough wear, heat, chemicals, acids, perfumes, and hairsprays.
NephriteDyeing, heating and infusion with paraffin waxWarm soapy water, a soft cloth, ultrasonic cleaners, and steamers are all safe. Avoid solvents and heat.
ObsidianNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe. Avoid steamers, heat, and chemicals.
OnyxDyeing, heating, irradiatingWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually okay to use . Avoid high heat.
OpalImpregnating with wax, oil, or plastic to improve play of color and/or to prevent or disguise cracking. Treatment with aniline dye, silver nitrate, or sugar carbonized by acid to create appearance of black opal. Smoke impregnating to create appearance of black opal.Warm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid contact with cosmetics, hair spray, perfume and household chemicals. Refrain from solvents, repolishing, sharp blows, and changes in temperature.
Oro VerdeHeating and irradiatingWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners and steamers.
PearlsBleaching, dyeing, irradiating, coatingWipe with very soft cloth after wearing. Mild soap with water is safe for a more thorough cleaning (if strung, be sure string is completely dry before wearing). Avoid ultrasonic cleaners, steamers, heat, all chemicals, perfumes, and perspiration. Store away from other items and avoid rough wear.
Pearls – ShellMan-madeMild soap with water and a soft cloth are safe (if strung, be sure string is completely dry before wearing). Not susceptible to damage from sweat, perfumes, etc. like their natural counterpart.
PeridotNo commercial treatments knownWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners, steamers, acids, and sudden temperature changes.
PraseoliteIrradiating/annealing to alter colorWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe. Avoid steamers. Do not expose to intense heat.
PrehniteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners, steamers, and sudden temperature changes.
PyriteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually safe. Avoid heat and nitric acid.
QuartzDyeing, heating, irradiating, quench crackling, and sometimes coating.Warm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe. Do not expose to intense heat. Avoid steamers, rough handling, strong solvents, and prolonged exposure to strong light.
QuartziteDyeing, impregnating with colorless plasticWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid chemicals and heat.
Rock crystal quartzNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe. Avoid steamers.
Rutilated quartzNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe. Avoid steamers.
RhinestoneFoil-backed glassA damp cloth and a soft dry cloth are safe (since these are often glued in their setting).
RhodochrositeNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Be mindful of scratching or chipping.
RhodoliteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe. Avoid steamers and sudden temperature changes.
RhodoniteDyeingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid rough handling and heat.
RockNo commercial treatments knownA soft, dry cloth is safe.
RubelliteHeating, irradiating, oiling, impregnating with resin, dyeingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid chemicals and temperature changes
RubyHeating, diffusing, dyeing, oilingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid harsh chemicals, strong detergents, solvents, and recutting or repolishing.
Glass filled rubyFilling of surface-breaking cavities or fissures with colorless glass or fluxes during the heat treatment process. Intended to improve clarity and color and may add weight.Warm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid strong detergents, common household chemicals, heat, pressure, recutting or repolishing, and jeweler's torches.
SandstoneLab createdWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers.
SapphireHeating, diffusing, dyeingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid harsh chemicals, strong detergents, solvents, and recutting or repolishing.
Diffused sapphireColor inducing by lattice diffusion of titanium from an external source. Always heated to improve appearance.Warm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid strong detergents, common household chemicals, heat, pressure, recutting or repolishing, and jeweler's torches.
Glass filled sapphireFilling of surface-breaking cavities or fissures with colorless glass or fluxes during the heat treatment process. Intended to improve clarity and color and may add weight.Warm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid strong detergents, common household chemicals, heat, pressure, recutting or repolishing, and jeweler's torches.
SardDyeing, heatingWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are usually safe. Avoid high heat.
ScapoliteIrradiating, heatingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid rough handling, heat, and jeweler's torches. When exposed to bright light, color may fade in purple stones
SeraphiniteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid chemicals and heat.
SerpentineDyeing, wax impregnatingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid heat, solvents, and prolonged exposure to strong light.
ShellDyeing, coating for protection, stabilizing to reduce porosityWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid sudden temperature changes, rough wear, heat, chemicals, acids, perfumes, and hairsprays.
SinhaliteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers.
SoapstoneDyeingA soft, dry cloth is safe. Avoid rough handling.
SodaliteDyeingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid cleaners, chemicals, and rough handling.
SpinelHeatingWarm soapy water, ultrasonic cleaners, and steamers are all usually safe. Light colored stones may fade under intense heat.
SugiliteDyeingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid solvents and rough handling.
SunstoneOilingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers.
SwanstoneNo commercial treatments knownWarm soapy water and a soft cloth are safe.
Swarovski crystalMan-madeA soft, dry cloth is safe. Remove jewelry before washing hands, swimming, and/or applying products (perfume, hairspray, soap or lotion) as this could cause discoloration and loss of crystal brilliance.
TanzaniteHeatingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid rough handling.
Tigers eyeHeat treating, dyeing, bleachingWarm soapy water and soft cloth are safe. Ultrasonic cleaners are usually safe. Avoid steamers and abrupt temperature changes.
TopazHeating and irradiatingWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid high heat and rough handling.
TourmalineHeating to improve color, irradiating to create color, impregnating with oil and/or resin to improve appearance. Acid treating and impregnating with plastic or epoxy filler for tourmalines displaying chatoyancy.Warm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid sudden changes in heat. Parti-colored stones tend to be more fragile at the color boundaries.
TsavoriteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners are usually safe (unless liquid inclusions are present). Avoid steamers and abrupt temperature changes.
TurquoiseDyeing, wax or plastic impregnating, sometimes with a colorant added. The proprietary Zachary process to improve durability and appearance.Warm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid high heat and chemicals.
Reconstituted turquoiseThis is a larger stone created from smaller turquoise pieces. Other treatments include stabilizing, coloring, and adding metallic veining.Warm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid high heat, sudden temperature changes, and chemicals.
Stabilized turquoiseStabilizing to increase durability and improve appearanceWarm soapy water and a soft cloth are safe. Never use ultrasonic cleaners or steamers. Avoid hot water and household chemicals.
UnakiteNo commercial treatments knownWarm soapy water and a soft cloth are safe. Ultrasonic cleaners and steamers are both usually okay to use. Avoid rough handling.
ZirconHeating (colorless and blue stones are almost always heated)Warm soapy water and a soft cloth are safe. Avoid ultrasonic cleaners and steamers. Avoid rough wear as these stones can abrade.
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