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Gemstones and Minerals
寶石與礦物
* 圖說:
				海藍寶石
* 圖說: 海藍寶石
What are minerals?

Except for a few layers of top soils on the surface, much of the Earth is made up of solid materials called rocks. These soils and rocks are products of minerals: the basic units of rocks. ..........

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What are gemstones?

Over 90% of gemstones are refined from naturally occurring minerals, formed via inorganic processes; the remaining 10% are organic gemstones, non-mineral material such as pearl, amber, coral and ..........

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Criteria for gemstone-grade minerals

Gemstone-grade minerals are mineral crystals that have been artificially cut and refined into collectible items and precious jewelry. A mineral deemed worthy of gemstone quality must fulfill the ..........

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