about precious stones,is topaz a precious stone,what precious stone is purple,identifying semi precious stones,define precious stone,semi precious stone guide
Green semi precious gemstones hardness of 9 degrees, and lower hardness of the semi precious rocks, in the parts that do not affect the appearance, use diamonds to scratch the semi precious stones suppliers, loose precious stones have red, blue, green, orange, purple, Yellow and a variety of colors, natural semi precious stones with a magnifying glass, with inclusions and cracks, light green semi precious stone
