This is a Traditional Retro Era 18K WHITE GOLD & DIAMOND ENGAGEMENT RING from a Maryland, USA Estate.
Center Diamond is a Modern Brilliant Cut, JK Color, SI3 Clarity Stone.
Accenting the center are 4 Modern Brilliant Cut Diamonds: .05 Carat ea; SI1 Clarity; HI Color. Therefore adding another .20 Carats & bringing the Total Diamond weight to 2/3 Carat approximately. Date this Ring ca. 1950's