Black Spinel and .30 ct. t.w. Chrome Diopside Turtle Pendant Necklace in Sterling Silver. 18"

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."

CABLE: One of the most popular and classic of chain styles, created from interlocking oval links unvarying in size.

LOBSTER CLASP: named after the pinching style of the hook, this clasp is often shaped like a lobster's claw. Use your finger to work the lever to open the clasp.

FIXED: A bale that is worked into the actual design of a pendant. Typically seen in slide pendants.

SPINEL: This rare and durable gemstone, found in a beguiling shade of inky black, catches the eye when set in rings, bracelets, necklaces and earrings. Spinel is also found in captivating tones of pink, purple and green. The red variety is beautiful in its own right and in ages past it was mistaken for a ruby.

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.