Thank you for contacting Mearto with your appraisal inquiry.

It is a beautiful antique ring. Such antique jewellery are being offered at auction on a regular basis.
The design and choice of material for the ring is lovely and underlines the beautiful and unique design. The way the gold is twisted and supporting the 50 diamonds makes it very elegant and special. I have not been able to determine the blue stones. They might be lapis lazuli however when I look closer at the blue stones I have my doubts, so therefore I cannot determine the blue stones. That would demand a real life examination.
The ring appears to be in good condition and without any or only minor signs of wear and use. It was made in the first half of the 1900s. The estimate is based on the blue stones being lapis lazuli.

I believe that this beautiful 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 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