The materials produced by nature, which are beautiful, траен, оскъден, and have technological value, and can be processed into ornaments are collectively referred to as natural jewelry and jade. Including natural gems, естествен нефрит и естествени органични скъпоценни камъни. 1. Natural gem stone Natural gemstones refer to single crystals (може да съдържа двойни кристали) of minerals that [...]
