Semi-precious-stones-list, the traditional list of gemstones that are considered precious stones are: all other gemstones are considered as being semi precious stones. these are old terms and not necessarily true these days. to view the treatments associated with each of these stones, visit our technical information on gemstones page.. A gemstone is a crystalline mineral that can be cut and polished to make jewelry and other ornaments. the ancient greeks made a distinction between precious and semiprecious gems, which is still used. precious stones were hard, rare, and valuable. the only "precious" gemstones are diamond, ruby, sapphire, and emerald., a relative newcomer to the world of gemstones, ekanite is rare and usually quite radioactive. when cabbed, some ekanites can display a star stone effect. most gem enstatites have indices in the range 1.663-1.673. the brown and green gems from tanzania are enstatites,....

In the west, precious stones are diamonds, sapphires, rubies and emeralds. all other stones are considered semi-precious stones. however, this is a commercial based classification and was a distinction that marketers created years ago which gives the false impression that precious stones are more valuable than semi-precious stones., orange and brown crystals when transparent may be of value. zircon crystals can be recognized by their square build and their hardness (h = 7.5). a colorless variety may be mistaken for diamond, but it is heavier (g = 4.7) and not so hard. crystals suitable for gems may be found in pegmatite dikes,....

Gemstone type list: guide to precious & semi-precious color gemstones. actinolite cat's eye gemstones. actinolite is a rare translucent variety of chatoyant actinolite. it is an amphibole silicate that is sometimes mistakenly called 'cat's eye jade'., if you are new to gemstones, or just curious about all the different varieties available, this photographic index shows the astonishing diversity and striking beauty to be found in the gemstone world. if you want a fine piece of jewelry, start with a fine colored gemstone from ajs gems. click on any gem photo to view the gems in that type..

Past precious stone names. except for the four gemstones in the present list, precious stones come and go. aquamarine, peridot and cymophane (cat’s eye) held their place in the list of precious stones up to the last century. tiger’s eye and amethyst only fell off the precious stones list in the 19 th century., this article needs additional citations for verification. please help improve this article by adding citations to reliable sources.unsourced material may be challenged and removed. this is a list of gemstones, organized by species and type..

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