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Idiochromatic: gem materials that derive their color from elements that are an essential part of their chemical composition.

Idocrase: a mineral species known as Vesuvianite.

Incise/Incising: cutting into metal to create a sunken line through the use of a graver.

Illusion Setting: a prong setting designed to make a diamond look bigger than it actually is.

Imperfection: A flaw or blemish, caused by nature or man, used when discussing gemstones.

Imitation: an object or gemstone which is used to mimic a more valuable object or gemstone.

Inclusion: substance visible within a gemstone, including fragments of a gemstone itself or tiny crystals.

Indian Pitch: A plaque made by pouring green glass onto gold foil that has been cut out in a mold of hunting scene motifs. Popular after 1876.

Ingot: cast metal bars.

Inseperables: A double needle stick pin brooch connected with a small and delicate chain. It came in use around 1835.

Inlay: a process in which one material is partially embedded into another material.

Intaglio: engraved stone with the design carved into the surface of the stone so that the rim is the highest portion. The opposite of a cameo.

Invisible Setting: also know as serti invisible. Stones that have been calibrated to very close tolerances and are cut with grooved girdles that are locked into a thin wire framework.

Iolite: a type of gemstone, usually blue.

Iridescence: rainbow effect inside or on the surface of a material produced by light interference or diffraction from thin films of gas, liquids or solids.

Iridium: a hard white metal used in jewelry to harden platinum.

Iron: a metallic element, sometimes used in the past to make jewelry. (Berlin Iron).


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