Alloy Two or more elemental metals can be combined to make a compound or alloy. This is done to change the visual properties such as color, or working properties such as increasing hardness, denseness, corrosion resistance and others.
Black Pearls Technically a “South Sea” pearl, it is cultivated by a special variety of the Pinctada oyster.
Carat Unit of weight used for gemstones. One carat = 0.2 grams.
Crown Term for the upper part of the faceted stone.
GIA Gemological Institute of America
Gold-Filled This term refers to a material (usually base metal), on which a layer of gold has been bonded by fusing.
Fusing Method of connecting pieces of metal by heating them to their melting point and allowing the surfaces to melt together.
Karat The relative amount of gold in an alloy is called Karat.
Nacre Outer layer of the pearl. Nacre is the same substance that forms the lining of the shell. It is composed of microscopic crystals of calcium carbonate.
Nickel Nickel is hard white metal used primarily as an alloying ingredient.
Ounce Unit of weight (troy ounce) used for precious metals. One ounce (oz) = 31.1 grams or 20 pennyweights (dwt)
Palladium Metal of the platinum group.
Pavillion Term for the lower part of a faceted stone.
Pennyweights Unit of weight used for precious metal. One pennyweight (dtw) = 1.5 grams.
Rhodium White metal from the platinum group. Used to plate over silver in order to inhibite tarnishing.
Soldering Process of joining two pieces of metal by using a third metal with a lower melting point.
South Sea Pearls These pearls are very large, white pearls often called the “queen” of cultured pearls. They are produced by a particular type of unusually large saltwater oyster, the pinctada maxima.
Sterling Term for a silver alloy containig 925 parts silver and 75 parts copper.
Tarnish Another name for corrosion on metals.