Work + Money on MSN3 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 ... who found it kept it hidden ...
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 ...