Not that this helps you, but there used to be Pollack who I think was eaten up by Burr Patterson and Auld. Burr Patterson and Auld was then eaten up by Herff-Jones. So, I think Herff-Jones and and Masters of Design are the two biggies.
The 3rd one would probably be Josten's, who do the grad rings and stuff like that. Maybe Google companies that make school rings, championship rings, etc. I only know of Josten's, but I am sure that there are others.
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