Thank you for contacting Mearto with your appraisal inquiry.

It is a beautiful vintage diamond and amethyst gold ring. Such vintage jewellery are being offered at auction on a regular basis.
The design of the ring is classic but still very modern. The amethyst appears both to have a good size and a nice colour. The circle of diamonds is a nice feature despite the missing stone. The gold is 14 kt. It bears some signs of use and wear however it is a nice and charming ring.

I believe that 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 amethyst gold ring has the best chance of realising its fullest potential. However, there is no measurement for the sentimental value you might attach to the 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