The ancient Romans believed a bride and groom would be guided to marry by the goddess Ceres' torch, which explains why we think Spinelli Kilcollin's 'Deux' stack of the same name would make a remarkable engagement set. Handmade from 18-karat yellow and rose gold, it includes two interlocked rings - an eternity band with glistening pink sapphires and a solid one - connected by tiny annulets.