Some of the best heirlooms that could be handed down come in the form of engagement jewelry. Pictured are some photo samples of 21st century heirloom diamond engagement rings that I ws able to find on www.onewed.com. Notice the inlaid diamond band detailing. The hand-engraving. The cushion-cut solitaire. The radial design. Fantastic jewelry like this should always, always be handed down. Always.