They are particularly popular with pre-teen and adolescent girls and with present-day hippies, deadheads or Rainbow Family participants. The smallest pattern, a double chain knot, requires two strings. The making of friendship bracelets is a version of macrame. Because of their versatility, they are worn by both males and females of all ages. The candystripe can have as few as three strings and as many as forty, based on pattern and thickness.

Theoretically a perfect diamond crystal could be composed of one giant molecule of carbon. After the magma cooled, it solidified into kimberlite, where the precious rough diamond is still found today. It is the strength and regularity of this bonding which makes diamond very hard, non-volatile and resistant to chemical attack.

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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