This standard specifies the grading rules for unmounted polished and faceted natural sapphires which have not been subjected to enhancement or heat treatment.
This standard is applicable to the unmounted polished and faceted natural sapphires which have not been subjected to enhancement or heat treatment.For the grading of inlaid faceted polished sapphires, this standard may be used as a reference.
This standard is applicable to the blue sapphire grading.The grading of sapphires with other colors may be carried out by reference to this standard.
定价: 516元 / 折扣价: 439 元 加购物车
This standard specifies the grading rules for unmounted polished and faceted natural rubies which haven't been subjected to enhancement.
This standard is applicable to the grading of unmounted polished and faceted natural rubies which haven't been subjected to enhancement. For the grading of mounted faceted polished rubies,this standard may be used as a reference.
定价: 516元 / 折扣价: 439 元 加购物车