Diamond
Diamond is actually adamas,which undergoes processes of a series of subtly cutting,carving and polishing.Admas is a natural mineral,a kind of original stone for diamond.To put it in a simple way,diamond is elemental crystal coming from element of carbon under high temperature and huge pressure in deep earth. Diamond ieself has significant value in terms of investment and collection. And moreover,value of diamond maintains a steadily rising trend in recent years.
Quality requirements:
National standard ：GB/T 16554-2010
Quality requirements:
National standard ：GB/T 16554-2010
