CJ Antiques has dated this Solitaire Diamond Engagement Ring to the 1940s.

Complete with IGI certificate. Circa 1940.
It is advisable to only buy diamonds or any precious stones that have been graded by one of the following bodies GIA, HRD, IGI, or IGR, Anchorcert, AGI. As independent laboratories those listed provide an unbiased assessment of a diamond or gemstone's qualities, which is what insurers look for. This is particularly important for high-value items, where an unbiased valuation protects both you and the insurance provider. C J Antique sonly use one of the listed bodies as these are usually the only ones accepted by most insurance companies will use for unbiased valuations in settling any claims.
CJ Antiques has dated this Solitaire Diamond Engagement Ring to the 1940s.
You can view the stock and full dealer information on the CJ Antiques Profile Page