准备晶体切割的第一步是清除表面的任何松动或断裂的物质——“表层”。 图片来源：Sonja Kreis Unique Jewelry 友情提供。
The brass gauge gives a good indication of the 615 ct topaz crystal’s dimensions. Photo courtesy Sonja Kreis Unique Jewelry.
然后，亚历山大轻柔地移除了任一表面深处的内含物，并开始根据自己的独特设计，雕刻晶体。 图片来源：Sonja Kreis Unique Jewelry 友情提供。
因为拓帕石的底部劈裂，所以需要锯断晶体基底的一部分。 图片来源：Sonja Kreis Unique Jewelry 友情提供。
As a final prerequisite for cutting, Alexander carefully examines the crystal for any other flaws and inclusions that need to be removed by grinding. Photo courtesy Sonja Kreis Unique Jewelry.
Stefan Kreis（斯特凡·克瑞斯）负责欧鲁普雷图的拓帕石矿的新生产业务。 如今的产量比 20 世纪 90 年代中期的全盛时期少得多。 图片来源：Sonja Kreis Unique Jewelry 友情提供。
Another portion of the base must be sawn away because it contains a cleavage crack that might become larger during cutting. Photo courtesy Sonja Kreis Unique Jewelry.
Alexander Kreis contemplates the original 615 ct Imperial topaz crystal. Photo courtesy Sonja Kreis Unique Jewelry.
A rotating cylindrical screen, known as a trommel, separates heavier minerals—including topaz—from waste rock at the Ouro Preto mines. Photo courtesy Sonja Kreis Unique Jewelry.
The topaz mines around Ouro Preto produce a variety of colors, including purple, pink, golden, natural blue, and the sought-after reddish orange to orange-red Imperial hues. Photo courtesy Sonja Kreis Unique Jewelry.
Today, as in the past, hydraulic mining methods are used to wash the topaz-bearing ore. Photo courtesy Sonja Kreis Unique Jewelry.
如今，欧鲁普雷图是一座繁华的城市，也是联合国教科文组织世界遗产。这里的繁荣、制度和美丽的巴洛克式建筑，一切都是因为这里的矿产资源——即金子、碧玺和拓帕石，这些矿产遍及周围的山上。 图片来源：Sonja Kreis Unique Jewelry 友情提供。
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