Gagate

Gagate, also known as jet, is a hard, lustrous black stone. Naturally, it is a fossilized coal. Sometimes it is called black amber.

Garnet

Garnet is a group of minerals that have been used since the Bronze Age as gemstones and abrasives. Garnets are most often seen in red, but are available in a wide variety of colors spanning the entire spectrum.
more info

Gem (Gemstone)

A gemstone is a mineral, rock (such in the case of lapis lazuli), or petrified material that when cut or faceted and polished is collectible or can be used in jewelry. Several organic materials like amber, coral and pearls are also considered gemstones.

Genuine Pearl

Genuine pearl, or natural pearl, is one that formed naturally within the shell of a mollusk due to an irritant rather than having the irritant placed into the mollusk by hand or being made out of plastic.

Geode

A geode is a rock whose crystal-filled interior can be hollow or filled. The crystals that form within the mineral crust of the geode is called druze. From the outside, geodes look like rounded, but otherwise ordinary rocks.

Gilding

An object decorated with a thin layer of gold, gold leaf or gold foil.

Givre Bead

Givre beads are beads made of transparent glass fused around a translucent core.

Glyptography

Glyptography is the art of engraving gemstones, making intaglio and cameos. Stones are engraved using grindstones with powdered emory or diamond as an abrasive.

Gold

A yellow precious metal which is valued for its beauty and purity since it does not oxidize or tarnish like most other metals.

Gold Electroplating

An electrolytic coating with gold, or with an alloy of not less than 10% fineness to a minimum thickness throughout.

Gold-filled

A gold alloy plate made by soldering, brazing, welding or other means that is not less than 10 karat fineness, where the plating constitutes at lest 1/20th of the weight of the metal in the entire article.

Gold Imitation

An alloy of zinc, tin and copper that results in a yellow the color of gold.

Goldstone

Goldstone is a type of glass made with copper or copper salts in the presence of a reducing flame. Sometimes gemstone aventurine is called goldstone because of golden glitter.
more info

Goshenite

Goshenite is a white or colorless beryl.

Gourd Stitch

That is the name of an off-loom bead weaving technique, also known as peyote stitch.

Graduated Necklace

A graduated necklace of beads or pearls has beads that go from a small size in the back of the neck and gradually increase in size to a maximum in the front of the necklace.

Grain

A grain is a unit of weight used for diamonds and natural pearls. Four grains are equal to one carat.

Granulation

One of the oldest jewelry design techniques, dating to 2500 BC. Tiny grains of gold or other metal are stuck to a surface as ornaments.

Grelot

Grelots are small beads that have an elongated, pendant shape.

Grossular Garnet

Grossular garnet is a type of garnet, resembling a gooseberry. Some of the species are:

• Hessionite is a transparent brown, yellow, orange, or honey-colored variety
• Transvaal Jade is green to gray grossular garnet
• Tsavorite is green to yellow-green grossular
• Uvarovite is an emerald-green grossular garnet
• Pink grossular garnets varieties include xalostocite, landerite, rosolite