Dear Marcia, here’s a few more sources to add to the good advice you’ve
Robert M. Hazen’s “The Diamond Makers” published by Cambridge
University Press 1999. This could be very useful. Hazen includes
detailed sources at the end of each chapter and writes with a clarity
that is rare in real-science writing. He develops all the elements of
history, science and politics in a manner which I think you would find
most helpful. And it’s all about man made diamonds.
Dennis Bruton’s “Diamonds” is almost the bible on this gem. You
shouldn’t have any trouble finding a copy of this excellent text book.
This next one is a little off field, but Albert Joris’ “A Destiny of
Diamonds” is a fascinating excursion into a little known era of
Australian diamond exploration. For someone like yourself who is
writing fiction, this would be great for a bit of local historical
colour. Joris’ book is self-published by Boolarong Publications in
Queensland, Australia. You could get a copy from the NSW Branch of the
Gemmological Association of Australia, 24 Wentworth Ave., Sydney, NSW
2000. Email them at email@example.com if this interests you.
Good luck with the novel, Marcia. I look forward to seeing it in
print. Kind regards, Rex from Oz