When you think of expensive gemstones, what comes to mind? Most people think of the Big Four: diamonds, emeralds, rubies and sapphires. However, it might surprise you to know that there are ...
Ultrasonic devices and commercial jewelry cleaners will remove the oils that the emeralds have been treated with and will cause damage to the gemstones. Always put your jewelry on after you’ve ...
Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. But mining black opal isn't easy. After investing tens of thousands of ...