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 ...

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 Most Expensive Axinite in the World While ... The fire opal is rarer than other types of opal, especially in gem-quality stones. While the background of a fire opal is milky or translucent ...

High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. Over 90% of black opals come from Australia, but they aren't easy to find.

You learn how difficult it is to retrieve the material and why many gemstones of top quality are so expensive ... and most valuable in the world. In Mexico, Participants will visit opal mines ...

In this list, Forbes Advisor rounds up the 10 public companies that have the most expensive share prices on major U.S. stock exchanges.

But adoption fees can be more than $5000 for some breeds, making them the most expensive dog breeds. There are currently about 200 AKC-recognized breeds of dogs in every size, color, and coat ...

The Senate races are among the most expensive, all ranking within the top ten according to figures from OpenSecrets. Here are the Senate races ranked from the most to least expensive. The figures ...

Auto insurance premiums are most expensive for teens and young adults because these age groups have a higher risk of car accidents and violations. Teenage drivers tend to pay the most for car ...

The most expensive states for millionaires tax high earners at high rates. (And if you fall into the top federal income tax bracket, the IRS will tax some of your earnings at the 37% rate.) ...