The attractive color of blue and especially purple gold alloys has always intrigued jewelry designers and producers. The reality of using these colors for jewelry has been very limited, however, mainly due to the inherent brittleness and poor corrosion resistance of this special class of gold alloys. The paper reports on some improvements in crack resistance that are obtained by particular additions to 14k blue- and 18k purple-gold colored alloys. Opportunities to incorporate such colors in jewelry design with these modified, colored-gold alloys using investment casting (as well as the still existing limitations) are discussed. Special attention is given to bi-metal casting technologies that can be used to manufacture multi-colored jewelry. A protective, transparent and wear-resistant coating finally needs to be applied to minimize corrosion and improve long-term stability of the colorful pieces.

中文翻译：

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有色金金属间化合物的冶金和加工——第二部分：熔模铸造和相关合金设计

蓝色，尤其是紫色金合金的迷人色彩一直吸引着珠宝设计师和生产商。然而，将这些颜色用于珠宝的现实非常有限，主要是由于这种特殊类别的金合金固有的脆性和耐腐蚀性差。该论文报告了通过特定添加到 14k 蓝色和 18k 紫金色合金中获得的抗裂性的一些改进。讨论了使用熔模铸造将这些颜色与这些改良的有色金合金结合到珠宝设计中的机会（以及仍然存在的限制）。特别关注可用于制造多色珠宝的双金属铸造技术。一个保护，