-جولة واسعة وثرية عن المعادن الثمينة والأحجار الكريمة
It is very rich information about the precious metals of gold and silver, such as weights, karats, colors, and methods of examining and weighing them
In addition to entering the world of precious stones, methods of extracting them, their locations, colors, types, methods of examining them, how to distinguish real gold, the most famous stones in the world, and a lot of important information.
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