The seller told her it was a rough brown diamond. Runsdorf, in disbelief, said she wanted it verified by the Gemological Institute of America. Sure enough, it came back as a certified 65-carat ...

And these Chocolate Diamond earrings that J-Lo likes to borrow: just over $16,000, but it wasn't that long ago when brown diamonds would have never made the red carpet, selling for six times less ...

Many diamonds actually show very pale colours, most often in shades of yellow, brown and grey. They are rejected as gemstones and used in industry instead, often as abrasives. However, on the rare ...

In the '80s and '90s, gem-quality brown diamonds were worth about $1,500 per carat, but now many sell for up to $10,000 per carat. And the price of larger stones has risen by as much as 25 times.