Googling biggest diamonds in Hollywood led me to
https://www.harpersbazaar.com.au/cel...nt-rings-14812
and
http://www.capetowndiamondmuseum.org...s-of-all-time/
which might have some other useful articles
and
https://www.pinterest.com/hancockjew...-in-hollywood/
https://www.worthy.com/blog/for-what...-diamond-ring/
from the last article sounds like you want
Quote:
Mouawad has acquired a collection of diamonds that is arguably one of the world's finest in private hands. Some of the largest diamonds in existence take their place among the stunning treasures in this museum-quality collection.
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https://www.mouawad.com/en/diamonds/diamond-gallery