十二月 1, 1993
《Gemstone and Chemicals: How to Create Color and Inclusions》(宝石和化学制品:如何创建颜色和内含物);《The Properties of Natural and Synthetic Diamond》(天然与合成钻石的属性);《Mineral Reference Manual》(矿物参考手册);《A Special Report from JPR on the Bold Retro 1940s Jewelry》(JPR 对 20 世纪 40 年代复古珠宝的特殊报告)
阅读详细内容