italian gold jewelry. Synthetic blue corundum has been produced commercially since 1902. Semiprecious stones include amethyst, garnet, opal, aquamarine, jade, turquoise, lapis lazuli, and malachite. Fashion is a style that is popular at a particular time. They are also known as blue corundum. The transparent gemstone is also the most popular gemstone. The most valued ruby is a pigeon-blood red. They vary in colour from yellow to bluish light color. There are colourless, gray, yellow, pale pink, orange, green, violet, and brown varieties of gem corundum. Probably the most widely used and highly prized material for jewellery-making is the yellow precious metal or aurum. Light colour precious spheres are characterized by their translucence and lustre. They are also known as blue corundum. Most transparent stones used as gems are transparent and colourless or nearly so. Transparent gems vary from colourless to black. Aurum hallmarks differ little from those on sterling. A pendant consists of a long chain with an object hanging from it, or the object itself. So, this gray precious metal has long been used in the manufacture of coins, ornaments. Synthetic blue corundum has been produced commercially since 1902. Semiprecious stones include amethyst, garnet.