Thank you for contacting Mearto with your appraisal inquiry, and I apologize for the delay. This solitaire ring is likely from the early 20th century. It is in excellent condition, with very minimal wear visible on the gold. The diamond settings are clean and sound, and there does not appear to be any damage to the stones or prongs. Given the condition of this piece, and completed auctions of similar items, a fair market estimation is 2,800-3,000 dollars. Please reach out with any questions.

Bo Stuck