Moonstone and 1.57 ct. t.w. Black Spinel Coil Ring in Sterling Silver. Size 6

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."

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.

MOONSTONE: named for the white reflection that mimics the reflection of moonshine. Typically polished and featuring a cabochon cut, moonstone's light-catching shimmer is perfect for fine jewelry. In Europe, moonstone is the birthstone for June.

OVAL: An elliptical shape that resembles an egg.

ROSE-CUT: An antique gemstone cut dating back to the 1500s, with a flat back and a faceted top.

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