Nano gems is the new synthetic material, have many natural colours, like Columbia emerald green colour, sapphire colour, brown colour and black colour and so on.
① all of them are stable in was casting, can keep natural colour under high temperature (1500-1750°C)
② have rich colours, near the nature gems colour, and no colour shade.
③ Mohs scale of hardness 6,5 - 7°, can reduce the wastage of setting.
Color: Emerald Green