I was lucky to see the Colorado 17 carat diamond on display in a jewelry store back in the 1980's. I believe there were some non-gem stones also displayed. I have a hand specimen of the Kelsey Lake pipe kimberlite; interesting rock but no diamonds.
Why no mention of Canada, which according to Google is "one of the world's top three diamond-producing countries by both volume and value"? An excellent book about the search for diamonds in North America is Kevin Krajick's Barren Lands (https://www.amazon.com/gp/product/1504029259).
I was focusing mostly on industrial diamonds (except in the US), and the USGS does not even list Canada as a producer. 98% of world industrial diamonds are from Russia and southern Africa.
You're correct that Canada is in the top four producers of gem diamonds, tied with Angola and Botswana at 19% each, after Russia's leading 30% of world production of gem diamonds. And yes indeed, that's a great book.
I was lucky to see the Colorado 17 carat diamond on display in a jewelry store back in the 1980's. I believe there were some non-gem stones also displayed. I have a hand specimen of the Kelsey Lake pipe kimberlite; interesting rock but no diamonds.
Nice!
My mineralogy final exam was on a kimberlite diamond thin section from Wisconsin. Fun memories!
Why no mention of Canada, which according to Google is "one of the world's top three diamond-producing countries by both volume and value"? An excellent book about the search for diamonds in North America is Kevin Krajick's Barren Lands (https://www.amazon.com/gp/product/1504029259).
I was focusing mostly on industrial diamonds (except in the US), and the USGS does not even list Canada as a producer. 98% of world industrial diamonds are from Russia and southern Africa.
You're correct that Canada is in the top four producers of gem diamonds, tied with Angola and Botswana at 19% each, after Russia's leading 30% of world production of gem diamonds. And yes indeed, that's a great book.
Earth naturally Fractionates material due to gravity.