The use of colored silicone rubber as a material for producing sports bracelets. The in-line thin diamond bracelet that features a symmetrical pattern of diamonds is called a tennis bracelet. A charm bracelet is an item of jewelry worn around the wrist. Bracelets made from connecting or linking various or similar components or jewellery findings. Sterling hearts beat with the promise of love in the exclusive design of this bracelet. Link bracelets can be made of a variety of materials included metals and gemstones.

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.

Next, many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic. They may have luminescence and a distinctive absorption spectrum. For example, diamonds are made of carbon (C) and rubies of aluminium oxide (Al2O3). Another term used is habit, the form the gem is usually found in. For example diamonds, which have a cubic crystal system, are often found as octahedrons.

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