Only two gemstones form in the Earth’s mantle Yellow Diamond from South Africa, a ...
10 月 13, 2017
6 月 6, 2017
The Definition of “Gemmology”. gemmology dʒɛˈmɒlədʒi/ noun noun: gemology the study of precious stones. ...
4 月 3, 2017
A brief understanding of Crystals, Minerals & Rocks Quartz crystal, Madagascar What are crystals? ...
