The origin of the name comes from a 1987 incident where Chris Evart, a world champion in women's tennis, broke a thin diamond-strand bracelet she was wearing while playing a tennis match. The match was halted so that the scattered diamonds could be re covered. These come in classic and modern styles. Since then, thin diamond bracelets had a new name-and a new popularity among diamond lovers. Some are also made up of gold, sterling silver and diamonds.

The non-metals include some elements known as semi-metals who share some properties with metals but differ in other characteristics. The hardest mineral known to man is from this subclass, as well as one of the softest. The Metals Subclass and related metal alloys contains metals whose properties are rather similar due to the common way in which they crystallize and bond.

Nowadays such a distinction is no longer made by the trade. Rare or unusual gemstones, generally meant to include those gemstones which occur so infrequently in gem quality that they are scarcely known except to connoisseurs, include andalusite, cassiterite and bixbite. Some minerals can be very beautiful, but they may be too soft and will scratch easily (such as the mineral fluorite). Fluorite is extremely colorful and pretty but has a hardness of only 4 on the hardness scale and has four perfect cleavage directions, which makes it only an oddity as a cut gem.

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