Cross back stamped RT inside of a

[Gmasoup]

Hi everyone, I''m new to the forum, glad I found you.

I purchased a beautiful 18K Yellow Gold Diamond Cross Pendant with about 4.40 carats total weight of diamonds. It is stamped with "RT" (inside of a diamond (the jewel diamond) and "750". This is the second piece I''ve gotten with the RT in the diamond and the 750. Both pieces are pave diamonds and 18K, earrings and now the pendant.
I have researched US trademark and Patent office and many other hall mark sites to no avail.

Can anyone identify the designer?

Thanks for help you can give me.
Gma Soup

 

[yssie]

750 is the European trademark notation for 18k gold - 75%. You might have more luck with European designers?

 

[Gmasoup]

Thanks for the suggestion.
I did try the International Search, I think it was the Madrid Express or something like that, but was not able to find anything.
I even tried the Italy trademark seach but couldn''t understand enough to work with it.

Any other suggestions?
Thanks again for your support.
Gma Soup

 

[yssie]

Not from me, unfortunately, but there's a wealth of knowledge here on PS - someone will know, or point you in the right direction!

 

[Gmasoup]

Thanks again. All help is appreciated.