Jewelry Rings

I have a ruby and a diamond ring with only 750 and other marking on it and am trying to understand what it is?

The ring is vintage or antique and my grandmother gave me is the mark of 750 on it and another mark, stamp which is in a box that I can not identify anyone have any suggestions on this??

may be the manufacturing company logo?

Emerald Cut Diamond Engagement Ring Vintage Style Crown ENR658.wmv

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