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 ...

This 1997 Shaquille O'Neal Metal Universe Precious Metal Gems in a PSA 4 sold for a record $20,400 in Alt Auctions. This is the record all-time for a PSA 4 copy. While Panini often releases rare ...

Spiny Oyster Shell is considered rare because it is only found in a limited geographic area and is only available in certain seasons. The Spiny Oyster itself is found in warm waters off the coasts ...

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 ...

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 ...