圆明亮琢型的上、下腰刻面倾角在GIA新切工标准中"EX级"的规范
원명량탁형적상、하요각면경각재GIA신절공표준중"EX급"적규범
"EX Level" Specification on Inclination of Upper and Lower Girdle Facets of Round Brilliant Cut in New GIA Cut Standard
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