Resin has become a popular material for jewelry, able to be carved, shaped, inlaid, studded … here, a cuff by Macha takes the form of rough hewn coal, with its glossy, craggy black surface. It has a metal core (no actual metal is specified, so I’ll go with stainless steel…)

The piece is described this way: Each bangle is hand-poured and created in an eco-resin, sourced from non-toxic industrial waste. The tiny imperfections and slight variations of colour are a natural result of the process making each piece unique. Resin should be treated as ceramic, durable but it can break if dropped.

It sells for USD $250 from OakNY.