The people at Biojewelry will take a biopsy of your living bone tissue, culture it, and sculpt it into jewelry for you. The core idea is the Cultured Bone Wedding Ring, where husband and wife swap cultured bits of themselves to seal the traditional pact.
Okay, I want a cultured human bone ring set with a Lifegem now. It's what all the well-dressed Necromancers wear!