TANZANITE
A variety of Epidote that is transparent and typically deep bluish violet, but also sometimes of other hues. The paler stones are subjected to heat treatment to produce the blue colour desired for gemstones. Transparent stones are faceted, cloudy ones are cut en cabochon. A specimen called "Midnight Blue", weighing 122.7 carats, is at the Natural History Museum, Washington, DC. The stones somewhat resemble Sapphire but are lighter and softer. Tanzanite was discovered in 1967 in Tanzania through the aid of Henry B. Platt, of Tiffany & Co., and was so named by him; in 1968 it was introduced by Tiffany to the jewelry world.

DIAMOND
The most familiar usage of diamonds today is as gemstones used for adornment a usage which dates back into antiquity. The dispersion of white light into spectral colors, is the primary gemological characteristic of gem diamonds. In the twentieth century, experts in the field of gemology have developed methods of grading diamonds and other gemstones based on the characteristics most important to their value as a gem. Four characteristics, known informally as the four Cs, are now commonly used as the basic descriptors of diamonds: these are carat, cut, color, and clarity...

WHITE GOLD
White gold is an alloy of gold and white metals such as silver and palladium. White gold can be 18kt, 14kt, 9kt or any karat. For example, 18kt yellow gold is made by mixing 75% gold (750 parts per thousand) with 25% (250 parts per thousand) other metals such as copper and zinc. 18kt white gold is made by mixing 75% gold with 25% other metals such as silver and palladium. So the amount of gold is the same but the alloy is different. When white gold rings are new they are coated with another white metal called Rhodium. Rhodium is a metal very similar to platinum and Rhodium shares many of the properties of platinum including its white color.

The Rhodium plating is used to make the white gold look more white. The natural color of white gold is actually a grey color. The Rhodium is very white and very hard, but it does wear away eventually. To keep a white gold ring looking its best it should be re-rhodium plated approximately each 12 months.