Work + Money on MSN4 个月
35 Most Valuable Gemstones, From Least to Most Expensive
When you think of expensive gemstones, what comes to mind? Most people think of the Big Four: diamonds, emeralds, rubies and ...
Business Insider3 年
Why black opal is one of the most expensive gemstones in the world
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 ...