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宝石切磨时要充分考虑台面大小、冠部角度、腰面厚度、亭部深度和长、宽比例(如图)。1.台面大小台面大小是相对宝石腰径而言的,与面高、冠部角度有一定的比例。就有色宝石来讲,台面大小影响着宝石的颜色、火、闪光和重量。表1 列出了几个国家专业机构所制定的钻石台面要求。对具有色散效应的宝石,设计时应使台面相应减小,因色散区主要集中于冠部的斜面区域。台面减小斜面区增大,光线将以不同的折射角度从亭部反射。此时钻石的台面应以53%左右为宜。宝石颜色较暗时台面大些可以透过
Gemstone cutting should fully consider the table size, crown angle, waist thickness, pavilion depth and length, width ratio (pictured). 1. Table size The size of the table is relative to the gem waist diameter, and face high, the crown angle has a certain percentage. In the case of colored gems, the size of the table affects the color, fire, flash, and weight of the stone. Table 1 lists the requirements of the diamond countertops set by several national professional agencies. For gemstones with dispersion effect, the design should be such that the size of the countertops should be reduced accordingly, as the dispersion area is mainly concentrated in the bevel area of the crown. Countertop decreases the bevel area increases, the light will be refracted from the pavilion at different angles of refraction. At this point diamond countertops should be about 53% appropriate. When the color of the stone is darker, the countertop can be larger