I believe where the British isles were was much warmer when it was living.
There’s a really awesome book called Jewels: A Secret History by Victoria Finley that’s a fun read. She does a chapter on the history of the gems that have been used the longest.
Jewels: A Secret History https://www.amazon.com/dp/0345466950/ref=cm_sw_r_cp_api_glt_i_D70VG339T1Z66J47CJ76
I LOVE this book. It only discusses ~~ten~~ nine gemstones, but it is so interesting. The author traveled the world to study each of them.
Free? The interwebs. Not free? I really enjoyed reading Jewels: a Secret History. I also taught myself a lot with this Smithsonian beginners’ gem book
I learned this in a book by Victoria Finlay called Jewels. (Apparently it has a new name now.) I love that book! Her other book is great too - Color.
Also in an article in National Geographic, March 2002:
>Goldberg had bought the diamond over the phone from Tel Aviv. When it arrived, he had taken it out on his terrace so he could be photographed holding it. Diamonds can shatter if struck in the wrong place, so one man had lain full length on the flagstones beneath Goldberg's outstretched hands, a human cushion in case Goldberg dropped the rough stone.
Edit: this comment was a misunderstanding. I thought we were discussing diamond durability.