Fluorite is extremely colorful and pretty but has hardness of only on the Mohs hardness scale and has four perfect cleavage directions, which makes it only an oddity as cut gem. gemstones have good hardness above 5 and high index of refraction the greater the sparkle. In cases, these variety names are historical, as the gemstones were not recognized as being varieties of other minerals until well after the name was in common use such as aquamarine, emerald, and heliodor as varieties of beryl. few are mineraloids not true minerals and are include here opal, amber, and moldavite.
Some minerals can be very beautiful, but they be too soft and will scratch easily such as the mineral fluorite. Gemstones in the Mineraloids class AMBER OPAL TEKTITES Variety MOLDAVITE Precious Metals in the Elements class Gold Platinum Silver . Others are too common and are given semiprecious status such as agate. In cases, these variety names are historical, as the gemstones were not recognized as being varieties of other minerals until well after the name was in common use such as aquamarine, emerald, and heliodor as varieties of beryl.
few gems are oxides and only one gem, diamond, is composed of single element, carbon. Some minerals can be very stable, hard minerals. few are mineraloids not true minerals and are include here opal, amber, and moldavite.
Others are too common and are given semiprecious status such as agate. What makes gemstone? Generally speaking, gemstone is stone that is beautiful, rare, and durable resistant to abrasion, fracturing and chemical reactions. Often, new names will be created for ordinary sounding minerals which sound prettier or more valuable, such as Moldavite for the green variety of tektites. gemstones have good hardness above 5 and high index of refraction the greater the sparkle. All gemstones have some characteristics falling short of perfection though even the seemingly perfect Diamond has four directions of cleavage.
What makes gemstone?
There are also many gemstones that are not true minerals, but which are gemstone varieties of recognized minerals. In some cases, the names are true misnomers, such as Green Amethyst for prasiolite transparent green variety of tektites. The pursuit of gems have become the subject of legends, fairy tales, epics, and major motion pictures Romancing the Stone, for one. gemstones have good hardness above 5 and high index of refraction the greater the sparkle.
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Tags: amber, amethyst, aquamarine, cleavage, color, cut, diamond, emerald, gem, gems, Gemstones, gold, hardness, opal, refraction, silver

