C.
Classic antique and a Gothic font, smooth onyx set with tiny rose cut diamonds. 10k gold and large - currently a size 11.5. Can be sized down to the smallest an eight. One of the diamonds has a small chip, which will be replaced when the ring is sized to fit its Cinderella.

When I found it I was told it was a D. And I believed it.

It is in fact, very clearly, a C.
Thank you for calling it out @goldfinder444 - evidence that no matter how much we think we know, we can easily slip into the sand pit of simply believing what we are told. Always a fan of a great metaphor.
Cost  includes the cost to size and replace diamond. Please email after purchase to discuss.
C U later!