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Identification of precious stones commonly used instruments and usage

to see fracture and cleavage fracture and fracture surface for what kind of luster, the identification of certain precious stones is particularly important. Most of the gem with glass luster for the shell-like fracture, translucent and opaque jade mostly granular, staggered fracture. Such as coral fracture is dull, jagged fracture; amber fracture for the resin […]

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