When two photographers got engaged in Japan, they asked their jewelry-maker friend to create wedding rings based on the Leica 50mm Summilux lens. The groom’s ring was the focusing ring while the bride’s was the aperture ring. The friend also created a stunningly realistic miniature Leica M3 to hold the rings (they slide onto the lens)!
(via Tokyo Camera Style)
Update: Here are some new photos of the rings:
This one shows the scale of the mini M3 next to actual Leica cameras: