A Precious Metal is a metal with rare metallic chemical element and due to that is of high economic value. Precious metals are less reactive than most elements, have high luster, and have higher melting points than other metals. Gold, Platinum and Silver are considered as p recious metals and used extensively in jewelry.
Gold is an extraordinary and rare precious metal, with an unmatched combination of chemical and physical properties. Gold is the most non-reactive of all metals and it does not oxidize under ordinary conditions. No other metal is as malleable as gold. Pure gold is very soft and pliable, and alloys of different other metals are combined with pure gold to enhance its durability and strength, as well as creating a blush in the gold’s appearance with different color tones. 24 karat is 100 % pure gold, and it is more expensive and less durable than gold that is alloyed with other metals.
Platinum, an extremely rare and expensive metal, is a silvery gray precious metal often used for setting or mounting high quality diamonds and gemstones. Platinum is a strong, durable and dense metal which is valued for its white color and purity.
Pure silver is very soft metal with its lustrous white color. Silver is used as jewelry metal well before the development of white gold alloys, and before platinum could be isolated. It is normally stable in pure air and water but tarnishes when exposed to ozone, hydrogen sulfide or sulfur.
Gemstones are classified into two categories, Precious and Semi-Precious, on the basis of their characteristics.
Gemstones which are highly valuable for their hardness and rarity, are known as Precious Stones. Precious Stones are generally expensive in comparison of Semi-Precious Stones.Precious stones include Diamonds, Emeralds, Rubies, and Sapphires.
Gemstones those are valued for their beauty and not covered under any one of the four ‘Precious Stones’, are known as Semi-Precious Stones. Semi-Precious Stones are available in all price ranges from low priced to high priced. Semi-Precious stones are Alexandrite, Amethyst, Aquamarine, Ammonite, Shell, Citrine, Garnet, Iolite, Onyx, Opal, Pearl, Peridot, Tanzanite, Topaz, Zirconia, Tourmaline etc