This super cool dome ring has a design that immediately reminded me of an egg- specifically a dino egg. Sorry, you probably can't unsee it now. However you interpret the design- it is a beautiful and unique vintage find, crafted in 18k with a subtle two-tone yellow and rose gold composition. 

18k Two Tone Dino Egg Dome- 12.8g - Size 6.5 (sizable)- Italian hallmarks - tapers from 13.25mm-4mm wide