إرسال الطلبات عبر الإنترنت

كتاب علم المعادن by zaamsam

ويبدأ المؤلف بتعريفه لعلم المعادن وتاريخه ، وعلاقته بالعلوم الطبيعية الأخرى. ينتقل بعد ذلك لشرح البلورات

الحصول على السعر

Joaillerie bijouterie Horlogerie pierres précieuses

Color (or the lack of color) is one of the prime aspects what determines the beauty of a gemstone. For every person the quality of color is depended on his or her personal senses, making color grading a very subjective matter that would be very hard to communicate with the lack of a general system to compare and describe colors.

الحصول على السعر

Joaillerie bijouterie Horlogerie pierres précieuses

The price of diamonds is ultimately determined based on the 4 C's "color, clarity, cut, and carat weight". Most people today have heard of the famous 4 C's made popular by DeBeers for consumers and the trade to judge quality, and hence, value when buying or selling.

الحصول على السعر

Joaillerie bijouterie Horlogerie pierres précieuses

Color (or the lack of color) is one of the prime aspects what determines the beauty of a gemstone. For every person the quality of color is depended on his or her personal senses, making color grading a very subjective matter that would be very hard to communicate with the lack of a general system to compare and describe colors.

الحصول على السعر

كتاب علم المعادن by zaamsam

ويبدأ المؤلف بتعريفه لعلم المعادن وتاريخه ، وعلاقته بالعلوم الطبيعية الأخرى. ينتقل بعد ذلك لشرح البلورات

الحصول على السعر

Joaillerie bijouterie Horlogerie pierres précieuses

la haute joaillerie de luxe. Vous serez convaincus par mes bijoux de luxe sublimes et originaux associés à de superbes diamants et pierres précieuses .

الحصول على السعر