| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting method for diamond, exhibiting stronger brilliance and observing a heart-and-arrow phenomenon and diamond obtained by the same. SOLUTION: Five pavilion main facets are formed so that a position shifted from the ridge line of a crystal shape on the pavilion formation side by about 15°is a ridge line in a diamond raw ore, and with reference thereto, ten pavilion main facets are formed. On the pavilion side of diamond, the ten pavilion main facets 19 are formed around an acute angle curette 18, and twenty lower girdle facets 20 are formed between them. COPYRIGHT: (C)2006,JPO&NCIPI
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