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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