| 摘要 |
PROBLEM TO BE SOLVED: To provide a diamond, allowing viewing of an arrow pattern and a heart pattern at the same time in a crown part under a predetermined condition. SOLUTION: In this diamond, when incident light from a table or a crown is reflected on one side pavilion and it is again reflected on the other side pavilion to produce outgoing light, an upper V-shaped line of the heart pattern is formed by a boundary line in the vicinity of a girdle facet point of adjacent pavilion facets. When outgoing light is transmitted through the crown and emitted, a lower V-shaped line of a heart pattern and the other lines of the heart pattern are formed by a boundary line of a star facet formed on the crown, thereby the heart pattern is visually recognized as well as the arrow pattern on the crown part. COPYRIGHT: (C)2010,JPO&INPIT |
