Fiery orange. Cyclamen pink. Icy blue. In warm or cool tones, topaz is a lustrous and brilliant gem. Topaz''s reddish pleochroic color often appears at the ends of cut gems. Rich reddish orange is one of this gem''s most coveted colors. Because topaz crystals are …
2021-8-18 · بوتسوانا is one of the most stable African countries and an important source of diamond and other ثمين materials Botswana is a dry country, which is mostly covered by the Kalahari Desert.Yet, below the arid earth lies significant deposits of diamond and other precious minerals. and …