JABOT  Long, narrow pin with decorations at both ends, like an arrow

JAPANNING  Process which blackens metal

JASPERWARE  High fired porcelain created by the Wedgwood Company

JELLY BELLY  Jewelry with a clear lucite stone at the center. Technically, glass and colored stones are not jelly bellies.

JET  Fossilized coal used during the Victorian period to make mourning jewelry.  Black glass is sometimes called French Jet

JEWELRY CASKET  Ornate jewelry box often with a locking mechanism and usually made of gold or silver

JUMP RING  Circular piece of metal with an opening used to hang charms or pendants

LAMPWORK  Hand-blown glass beads and jewelry

LAVA  Volcanic rock

LAVALIER  A pendant with a dangling stone that hangs from a necklace

LOCKET  A pendant which opens to reveal a cavity for photos, hair or other small object

LORGNETTE  Opera glasses with a long handle

LOUPE  Jeweler's small magnifier held up to the eye

LOVE TOKEN  Coins polished clear of mint marks and then engraved with initials or pictorials

LUCITE  A plastic material introduced by Dupont in the 1930s

MARCASITE  Metallic, semi-precious stone; it sparkles when faceted; also called Cut Steel

MATCH SAFE  Small box, often ornate silver or gold, used to hold stick matches

MICROMOSAIC  Use of very small, fine pieces applied as in mosaic

MILLEFIORI  Italian word meaning "thousand flowers."  Glass that is formed from multiple canes of colored glass that are fused together and cut crosswise

MINE CUT  A square stone with rounded corners

MIZPAH  An emotional bond between two people who are separated.  The double heart motif often includes the Biblical passage:  "May the Lord watch between you and me when we are absent one from the other."

MODERNIST  A departure from the traditional; incorporates abstraction and impressionism

MOSAIC  Jewelry and souvenirs made out of extremely small pieces or tiles of stone, glass or other materials

MOTHER-OF-PEARL  Iridescent coating on the inside of mollusk shells

MOURNING JEWELRY  Type of jewelry worn after the loss of a loved one; often made of jet, onyx, bog oak or ebony; sometimes has hidden compartments for hair or photos

NICKEL SILVER  Also called German Silver; there is no silver in nickel silver.  It was invented as a silver substitute

NIELLO  An old technique in which an engraved design in metal is filled with an alloy powder then heated and fused.  After polishing, it can resemble enamel

OBSIDIAN  Naturally formed glass-like material found in igneous rock and lava

OBVERSE  Front side of a coin or piece of jewelry

ONYX  A variety of chalcedony; usually black