Late victorian ring

My boyfriends family gifted me this antique ring from his great grandmother. It is american late Victorian to very early Edwardian yellow-gold emerald and diamond floral cluster ring, with one central diamond, six emeralds and eighteen outer diamonds, based on the family history it is c.1880–1910. No hallmarks which I think is typical for the US and the era. Anyone know how I can find anything about its likely age given the style?

 

Nice Family !!!!!

Nice ring as well......

 

I don't know anything about the age.....but the emeralds look to be spectacular!
Does the center diamond have a cutlet? (Bottom point cut off leaving a flat area)

 

called a cocktail ring , I think.

 

If there are marks inside of the ring, they would help. If nothing else, good shots of the back of the ring will tell its tale; the information we need is on the back.