Bracelets became increasingly popular with men during Grecian times. From the Latin term they were called Bracels for arm, "Brachium". They have been crafted from different materials. And it has always been popular - bracelets have varied according to dress styles and, of course, dictated by fashion. They make for trendy, unique items of jewelry. Like a women bracelets are also worn by men. Bracelets today are not only of traditional materials, but also of acrylics and modern plastics. The Grecian women realized that these accessories would look good on them, so they began wearing smaller versions called Bracel etc.

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.

Elements, by the chemical definition are composed of all the same atoms; whereas substances composed of two or more elements are compounds. These minerals, which combine metals such as iron with the very non-metallic elements of carbon, nitrogen, phosphorous and silicon, are quite unique and quite rare. But the sulfides class is by convention limited to sulfur and semi-metal combinations as discussed above. They are not too different from sulfides which typically combine metals with sulfur.

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