In the opal cutting process the potch is ground away from the presentation areas of the gem opal.

在蛋白石切割过程的大杂烩是地面距离的介绍领域的宝石蛋白石。

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In the opal cutting process the potch is ground away from the presentation areas of the gem opal.

在蛋白石切割过程的大杂烩是地面距离的介绍领域的宝石蛋白石。

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