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What does OCR mean on the inside of a ring? GTR?

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sweet_pea

sweet_pea

Shiny_Rock
Joined
Jul 20, 2011
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250
It's a white gold ring with amethysts and small diamonds.

Also, I have a opal and yellow gold ring probably from the 1970's and it says GTR on the inside of the band. Are these just maker marks?
 
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