The essence of grades standard is gemcutting database - processing rules system, for cutting data determines cutting quality.
评级标准的实质就是切割数据，因为切割数据决定着切工品质。
2
In the opal cutting process the potch is ground away from the presentation areas of the gem opal.
在蛋白石切割过程的大杂烩是地面距离的介绍领域的宝石蛋白石。
3
I must applaud Dr. Rath as a progressive, cutting-edge health pioneer and consumer advocate! This book on heart disease is truly a gem, as far as cellular health and nutrition are concerned.