Jewelry and Gemstone Glossary of Terms

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Facet

One of the flat polished surfaces cut on a gemstone which allow the cut stone to sparkle and reflect light. Diamonds, emeralds, sapphires, and rubies are normally faceted.

Feldspar

Feldspar is the name given to a group of common rock-forming minerals. Feldspars occur as compact minerals, as veins, and are present in many types of metamorphic and sedimentary rock.

Fire

Fire in a stone refers to the streaks and flashes of brilliant color(s) seen when the stone is rotated or moved in a natural or artificial light source. Opals are noted for their fire.

Freeform

A stone cut in an unusual or non-calibrated shape.

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