Precious Metal Gems (PMGs ... high-end collecting and remain among the most coveted cards from the era. But what is it that makes these cards so valuable? Let’s take a closer look.

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 ...

Large gems are rare and most fluorite stones used in jewelry are ... In the past, moldavite has also been known as chrysolite. Raw moldavite has a rippled, flattened shape, so jewelry makers ...