Archivio Tag: Classificazione del valore commerciale delle gemme

gioielli in argento all'ingrosso 925 Classificazione del valore commerciale delle gemme

Finora, più di 4,000 kinds of minerals have been discovered in the world, of which nearly 600 can be called gems, and about 30 common gems. The factors considered for the classification of gems include: the genetic type of gems, the habits and traditional culture of the international jewelry industry, and the traditional Chinese […]