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(Aquamarine)
海蓝宝石是绿柱石最重要的品种。其颜色系含微量元素二价铁所致。颜色由浅蓝至深蓝色不等,包括蓝绿色和绿蓝色,含铁量的多少会影响晶体颜色的深浅。宝石常见1~15克拉,也有更大的。小宝石一般颜色较浅,大颗粒宝石容易聚集颜色显得比较深。海蓝宝石通常比较洁净,高品质的海蓝宝石对净度要求更高,通常要求无瑕,肉眼可见瑕疵者会降低宝石等级。刻面宝石大多切磨成祖母绿琢型,以显示更明亮、更多的火彩。净度不高或半透明雾状的晶体,大多会加工成佩件、串珠和雕刻件。
·雨滴状平行细管物是海蓝宝石最常见的内含物特征
·海蓝宝石吊坠
海蓝宝石通常会做低温加热处理,除去绿色调,从而使蓝色更加浓艳纯正。加热处理后的宝石颜色稳定。也有通过辐照处理的,一般辐照处理能获得更深的蓝色,但有时会失去火彩。
Natural aquamarine tends to form long, prismatic or tabular crystals. A catch-all for every pale blue to deep blue transparent to translucent beryl, aquamarine derives its color from divalent iron, the amount of which determines its hue and intensity.Aquamarine can be heat-treated to eliminate its green tones and enhance its blue tones. The more intensely blue a stone is, the more valuable. Irradiation typically turns aquamarine yellow.
The most common inclusions in aquamarines are slender parallel tubes known as “rain”. (Page 88)
·1984年,本书作者沈雄(左)受邀前往中国新疆可可托海3号矿考察
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