The materials produced by nature, which are beautiful, διαρκής, σπάνιος, and have technological value, and can be processed into ornaments are collectively referred to as natural jewelry and jade. Including natural gems, Φυσικά νεφρίτη και φυσικά βιολογικά πετράδια. 1. Natural gem stone Natural gemstones refer to single crystals (μπορεί να περιέχει διπλούς κρυστάλλους) of minerals that […]
