Figure 1. This emerald contains a brown crystal of the rare mineral parisite. There is also an oil-filled cavity showing a blue and orange flash effect, along with two large trapped gas bubbles. This inclusion suite verifies the natural origin of this emerald; it also confirms that the stone, which shows signs of clarity enhancement, is from Colombia. Photomicrograph by John I. Koivula; field of view 3 mm.
规划大块高价值祖母绿原石的切工时需要特别谨慎,这样才能带来利润。 重量保留目标、最佳正面色彩和净度以及如何通过处理来影响外观需要数年甚至数十年的经验才能确定,只有这样才能在当今的市场上保持竞争力。 摄影:Andrew Lucas(安德鲁·卢卡斯)/GIA,由Multigem Creations/Real Gems Inc. 友情提供。
GIA 团队用数千张照片和近百小时的视频详细记录斋浦尔的祖母绿产业。 摄影: Andrew Lucas(安德鲁·卢卡斯)/GIA,由 Samit Emeralds/Real Gems Inc. 友情提供。
由于多年以来持续的供应以及积累的切割知识,Multigem Creations 公司开始从切割巴西巴伊亚产低品质小块原石转向切割赞比亚产大块高价值原石。 摄影: Andrew Lucas(安德鲁·卢卡斯)/GIA,由 Multigem Creations/Real Gems Inc. 友情提供。