円型ブリリアント・カットのハート,アローマークパターン

概要

論文の詳細を見る
Recently the round brilliant cut diamond which shows a heart and arrow shaped patteren observed on a certain illuminating condition has got into the news in Japanese market. Such a stone has sometimes been regarded as an excellent cut. Studies on the reasons and conditions of the appearance of this patteren revealed that (1) this patteren can be seen when a stone is illuminated in an inclination of 9 to 15 degree to the axis of brilliant, and (2) this patteren is mainly due to the arrangements of pavillion side facet of brilliant, i.e. pavillion facet and bottom brilliant facet, and scarcely to the crown facets, and (3) therefore a stone showing this patteren cannot automatically be regarded as an excellent cut brilliant. The appearance of this pattern is a necessary condition but not a sufficent one for excellent cut brilliant cut diamond.
1993-12-31