Half-hoop

A bangle, bracelet, or ring in which only half of the circumference of the piece is set with stones.

Hardness

The measure of a stone's ability to resist scratching, surface inclusions, abrasions or cracking.

Hawk's eye

A blue variant of tigereye is called hawk's eye.
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Hammering

Giving metal surface marks and textures by hammering.

Heishe Bar

Narrow spacer bar used to hold heishe beads, bugle beads, liquid silver or seed beads parallel and prevent tangling.

Heishe (Heishi) Bead

The literal meaning of heishe is "shell" and specifically refers to pieces of shell which have been drilled and ground into beads and then strung into necklaces. More frequently heishe has come to refer to hand-made tiny beads made of any natural material.

Heliodor

Heliodor is a greenish yellow variety of beryl.

Heliotrope

Heliotrope is an inexpensive type of chalcedony that is green with red spots of jasper, most common name is bloodstone.

Hemalyke

Hemalyke is a synthetic hematite that is made by grinding up hematite, adding a binder (glue) and then press-molding it.

Hematite

Hematite is the mineral form of iron oxide, colored black to steel or silver-gray, brown to reddish brown, or red.
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Hessonite

A variety of garnet which is yellow in color. Also called cinnamon stone.

Hoop Earring

An earring made from metal wire or tubing that has been shaped like a hoop. Charms and other ornaments are sometimes hung from the hoop.

Howlite

Howlite is a soft, white to gray mineral that takes dye very easily, and can be dyed to imitate some other gemstones, such as turquoise.

Hyacinth

A variety of zircon used as a gem which can be brown, red, orange, or an amber-like combination of yellow, orange, and brown.