18KT: Karat (abbreviated kt or K) is a unit that indicates the purity of gold in the metal. 18kt is 75% gold. In Europe, 18K yellow gold is most favored and used in jewelry.

YELLOW GOLD: Gold is a precious metal with a natural yellow color. It is quite soft and often alloyed with other metals to increase its strength. The purity of the metal is indicated by a unit called a "karat," with 24kt having the highest percentage of natural gold.

STERLING SILVER: Also known as "Standard Silver," sterling silver is silver alloyed with other metals to increase the hardness and durability. Generally, sterling is 92.5% silver and 7.5% other metals. Some sterling silver jewelry is plated with 14kt-18kt gold and referred to as "vermeil," or "gold over sterling."

AMETHYST: A natural variety of quartz, amethyst ranges in color from deep purple to pale lavender, and even to warm greens. Amethyst has been used during meditation to provide a sense of spiritual balance. Amethyst is the birthstone of February.

PEAR: Similar to the outline of a pear fruit, this is a round shape that comes to a point on one side.

DIOPSIDE: Though quite rare, diopside is one of the most affordable green gemstones. This gorgeous newcomer, mined mainly in Siberia, lights up jewelry designs with vibrant shades of green and makes an ideal choice for pendants, rings and earrings. The most popular variety is chrome diopside which features a medium-dark vivid green hue.

GARNET: the birthstone of January. One glance at the deep red seeds nestled inside of a pomegranate explains why the word "garnet" comes from the Latin word "granatus," meaning "grain" or "seed." This name was given to the garnet because of its close resemblance to the succulent seed.