What determines whether a gemstone is precious or semi precious?
Is it the composition of the stone? cut ? or rarity?
The World Jewelry Confederation (CIBJO) is responsible for creating a definitive set of standards for the grading, methodology and terminology of diamonds, colored gemstones, pearls and precious metals.
The World Jewelry Confederation defines a precious gemstone as a “natural inorganic material, with the exception of metals, used in jewelry.
Semi-precious, is used to describe gems that are not a rare stone, is now “misleading”.
Almost all gemstones can be defined as precious, except the pearl. It is also formed with organic matter rather than inorganic material. A protein called conchiolin* (a fibrous protein the forms the iridescent inner layers, as mother-of-pearl, in the shells of mollusks) is an essential part of the substance that forms a pearls’s nacre* (its what makes up the outer coating of pearls. It is strong, resilient, and iridescent.
Natural and cultured pearls are really quite unique in the gemology world.
“the queen of gems and the gem of queens”.
Love Nikki xxoo