This is a PLATINUM DIAMOND ENGAGEMENT RING RETRO ERA ca. 1950 - 1975 with .60 CARAT CENTER DIAMOND.
That .60 Ct Stone is VS1 VS2 HI COLOR EUROPEAN CUT. There are 2 Addtional Diamonds on each side & two Rubies on each side. Those Accenting Precious Stones add another .10 Carat to .12 Carat
Gem Weight. Platinum Mounting is a Size 6
.... May attempt to tweak these pictures as time allows