Semi Precious Gemstones
Some gemstone from Sapphire, emerald or ruby are include in semi-precious gemstone if the gemstones only had one or two of these quality.
Precious Gemstones
To decided it’s a truly precious gemstones, that must be had a brilliance, beauty, durability and rarity. So we can call it a high quality gemstones.
Characteristic
Color - most important and individual characteristic
- should be rich, not so pale (anemic appearance, nor so deep as to make it
look dark or even black)
-Too dark a color reduces transparency and a stone should retain a lively look
with some sparkle, which is achieved by skillful cutting and faceting. In many
stones the distribution of color is uneven.
The ten standard minerals are known as Mohs' scale. They are:
1.Talc
-Talc finds use as a cosmetic (talcum powder), as a lubricant
2. Gypsum
-from brazil,( can found in Massive, flat. Elongated and generally prismatic crystals)
3. Calcite
4. Fluorite
-Fluorite crystals on display at the Cullen Hall of Gems and Minerals
5. Apatite
-as a source of phosphorous to be used in fertilizer, rarely as a gemstone and as a mineral specimen
6. Orthoclase feldspar
-Can be numerous colors, including grey, white, pink, green and brown, but the most valuable are deep blue
7. Quartz
-Quartz crystal cluster from Tibet. (colorless through various colors to black)
8. Topaz
9. Corundum
-The red variety of corundum is known as ruby and all the other colors of corundum are known as sapphire.
10. Diamond
-Diamond is the hardest natural material known, first recognized and mined in India for at least 3,000 years but most likely 6,000 years.
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