belle epoque sapphire and rose cut diamond cocktail ring

An early 1900s rose cut and sapphire cocktail ring. This ring almost looks Edwardian, but I believe it to be a bit more belle époque, so, basically, I'm not sure exactly the age of this ring. 🤷♀️ Some things really stumped me, this is one of them. But I can tell you that it's absolutely stunning, and really, that's what matters most. This ring test silver platinum and gold. My best guess is that it is silver topped, with a gold band, that may have been sized using platinum. I do believe that it has been dipped to achieve this metal color, which was common back in the day, but what makes it so unique and impossible to replicate is that now that plating has worn off a bit it is now showing a cool gold color. Estimating rose cuts is almost impossible for me, but I would say that there is approximately 1.5 CTW of diamonds. The center sapphire appears to be synthetic, which is common for the timeframe and is in very good condition, with no nicks or abrasions to the surface. The entire ring measures 24.64 x 12.24, weighs 2.8 g, it is a size 3.75 sizable