A jewel you ll love in a heartbeat This beauty from Cartier has a slim shank that curves ever so slightly to form a subtle bypass shank. The tapering shoulders support a heart shaped frame fully covered with brilliant diamonds totaling 0.45 carats. The ring s top dimensions measure 10mm by 10mm.This Cartier 18K Yellow Gold 0.45ct Diamond Heart Ring is offered in estate condition and comes with a gift box.