Thank you for contacting Mearto with your appraisal inquiry.

It is a beautiful cameo ring. Such vintage jewellery are being offered at auction on a regular basis.
The cameo is lovely with a beautiful woman motif. It is cut out of a seashell which makes the variation in colour. This was popular around the late 1800s and early 1900s. Today you mainly see cameo brooches or pendants which are also the most popular cameos.

However the design of the ring would attract the attention of both collectors and dealers if it came up for auction.
The estimate provided is for a well-advertised specialised online jewellery auction, where I believe the cameo ring has the best chance of realising its fullest potential. However, there is no measurement for the sentimental value you might attach to your grandmothers ring. Retail "asking prices" can be higher and vary.

Please let me know if you have any additional questions. I’m happy to help.
Thank you