Following is a transcript of the video. 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.

Opals are formed when water and silicon dioxide ... Rubies can be exceptionally expensive. One ruby, weighing 25.59 carats ...

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.

The Grand Central Terminal in New York City is the largest train station in the world by area and the number of platforms.

Your brain might not automatically jump to "ornate" or "expensive," given the relative simplicity of Kate Winslet's silk, ...

As billion-dollar disasters like hurricanes Helene and Milton grow more common, many blame global warming. Others say disasters are more expensive because there is more to destroy.

Opal Dividend Income ETF is a solid pick for folks wanting to earn some cash now and see their investment grow later. Learn ...

I remember growing up and being made fun of. Opal is not a common name. I felt like I was different. I was embarrassed of my culture and my identity. Now, as I’m older, I’m so proud of my ...

The Price to Earnings (P/E) ratio, a key valuation measure, is calculated by dividing the stock's most recent closing price by the sum of the diluted earnings per share from continuing operations ...

The Season of Hatred Rising introduces Seething Opals, a new buff-granting resource earned by bringing down colossal Realmwalkers in the open world and delving into the Seething Realms they leave ...

Following is a transcript of the video. 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.