gem opal 中文意思是什麼
gem opal
解釋
寶石蛋白石-
It is important that the opal is protected from heat and detergents that " dry " the gem. if the opal develops crazing or is allowed to dry out it will lose its iridescence
最佳的變彩依次是:紅色紫色橙色黃色綠色和藍色,紅色紫色或橙色顏色強度較高,分佈又廣,就很有價值。
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