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5.29 克拉「緬甸」天然藍寶石配鑽石戒指, 藍寶石未經加熱處理

<em>Gübelin Report: Burma, no indications of heating AGL Report: Burma, no gemological evidence of heat GRS Report: Burma, no indications of heating 附瑞士Gübelin, 美國AGL及瑞士GRS證書</em>
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