来自MSN2 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 sapphires. However, it might surprise you to know that there are ...
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 ...
Business Insider3 年
Why pearls, black opal, and chocolate diamonds are so expensive
The shinier the pearl, the better. Black opal is one of the rarest gemstones in the world, sought after for its seemingly infinite display of colors, compared to common opal, which is usually one ...
protothema.gr3 天
Tanzanite: The impressive gemstone that became the new trend in jewellery
Its rarity, combined with its ever-increasing demand, makes it one of the most sought-after jewels of the moment.