Sterling silver is an alloy of silver containing 92.5% pure silver and 7.5% other metals, usually copper. The minimum millesimal fineness is 925. The term "Sterling Silver," in reference to the .925 grade of...
Amethyst was used as a gemstone by the ancient Egyptians and was largely employed in antiquity for intaglios. Beads of amethyst are found in Anglo-Saxon graves in England. It is a widely distributed mineral,...
Rhodonite is a manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3 and member of the pyroxene group of minerals, crystallizing in the triclinic system. It commonly occurs as cleavable to compact masses with a rose-red...
Moonstone is typically a potassium aluminium silicate, with the chemical formula KAlSi3O8 The most common moonstone is of the mineral Adularia. The Plagioclase Feldspar Oligoclase also produces moonstone...