- Diamonds
Diamond
The hardness of diamond contributes to its suitability as a gemstone. Because it can only be scratched by other diamonds, it maintains its polish extremely well. Unlike many other gems, it is well-suited to daily wear because of its resistance to scratching—perhaps contributing to its popularity as the preferred gem in engagement or wedding rings, which are often worn every day.- Emeralds
Emerald
Only gems that are medium to dark in tone are considered emerald; light-toned gems are known instead by the species name green beryl. In addition, the hue of an emerald must be bright (vivid). Gray is the normal saturation modifier or mask found in emerald; a grayish-green hue is a dull green.- Sapphires
Sapphire
Sapphires are mined from alluvial deposits or from primary underground workings. The mining locations include Burma, Madagascar, Sri Lanka, Australia, Thailand, India, Pakistan, Afghanistan, Tanzania, Kenya, and China. - Rubies
Ruby
A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red.- Ambers
Amber
Amber is fossilized tree resin (not sap), which has been appreciated for its color and natural beauty since Neolithic times.[2] Amber is used as an ingredient in perfumes, as a healing agent in folk medicine, and as jewelry.
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International Gemological Institute
International Gemological Institute (IGI) is a diamond, colored stone and jewelry certification organization.IGI Worldwide
Gemological Institute of America
The Gemological Institute of America, or GIA, is a nonprofit institute dedicated to research and education in the field of gemology and the jewelry arts.IGI Usa