| 摘要 |
PROBLEM TO BE SOLVED: To provide an art of manufacturing a jewelry frame using noble metal such as a platinum alloy by a lost wax casting process, which is most frequently used in manufacturing the jewelry, mounting a diamond on the frame in a flexible, soft and easily workable state, and performing heat-curing based on the Japan Patent Application Nos. 1994-083349 and 1995-192572 and providing the jewelry satisfying the practical strength without damaging the diamond. SOLUTION: Even if the noble metal such as the platinum alloy mounted with the diamond is heated to a high temperature of 700 to 1,000°C for a predetermined time in the atmosphere with a mixture obtained by mixing boron carbide, borax and salts at a predetermined ratio using a sealed heat treatment vessel dedicatedly manufactured, the inside of the sealed heat treatment vessel is constantly retained at a reduction atmosphere by adjusting the ratio of the boron carbide, the borax and the salts. This constitution can exhibit an effect without damaging the diamond. COPYRIGHT: (C)2005,JPO&NCIPI
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