romantic gift ideas. Jewels are worn on clothes or on the body. Jewels are decorative objects. The Light color precious sphere consists of the same material, called nacre, or mother-of-pearl as the mollusk's shell. The stone is sometimes called oriental ruby to distinguish it from other red gems. In origin they were animal rather than mineral. Amber, a fossil tree resin, is a highly valued stone. The cameo is a piece of usually oval jewellery. The brooch has a pin at the back that is fastened to a woman's clothes. Red varieties are called ruby. The surface of a light colour precious sphere is rough to the touch. A transparent gemstone marriage ceremony is often an occasion for a party or other type of celebration. Most transparent stones used as gems are transparent and colourless or nearly so. Colourless or pale blue stones are most valued, but these are rare. Synthetic blue corundum has been produced commercially since 1902. And this mainly in the addition of marks reflecting the proportion of pure aurum in both karats and percent. Semiprecious stones include amethyst. Jewels are worn on clothes or on the body. Jewels are decorative objects.