Hololith

Type B + C natural jadeite jade hololith ring
Photo courtesy of Scott Papper, GIA GG, AJP, CM (NAJA), Global Gemology & Appraisals
A hololith is a ring (or bracelet) made from a single piece of stone.

Jadeite is commonly carved into hololith bangle bracelets, as well as hololith rings.