When you purchase jewellery or a gemstone, you always go through the process of evaluating its purity and to know whether it is genuine or not. Whether the gemstone is man-made or natural, there are ...
Red spinels, tourmalines, rubies and synthetic rubies may look identical to the naked eye. Yet their prices can vary from US$300 to US$3,000 per carat. So how can you tell them apart? Rubies are rare ...
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