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About Promise Rings & Gems
Gemological Institute of America - Established in 1931, the Gemological Institute of America is the world’s foremost authority on diamonds, colored stones, and pearls.
Promise Rings on Wikipedia - A ring worn to signify a commitment to a monogamous relationship.
Promise Rings on About.com - Promise rings are bestowed to symbolize a promise that one person makes to another. In some cases, promise rings are precursors to engagement rings. While the latter symbolize a promise to marry, promise rings can stand for many other kinds of vows.
Gemstones on Wikipedia - A gemstone or gem (also called a precious or semi-precious stone, or jewel) is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments. However certain rocks, (such as lapis lazuli) and organic materials (such as amber or jet) are not minerals, but are still used for jewelry, and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their lustre or other physical properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone. Apart from jewelry, from earliest antiquity until the 19th century engraved gems and hardstone carvings such as cups were major luxury art forms; the carvings of Carl Fabergé were the last significant works in this tradition.