Four Infinities in nephrite jade

The same puzzle as our wooden piece of the same name, with every wooden part cut from nephrite jade instead. Each part is shaped from one piece of stone, polished by hand, and every edge and corner is rounded so the stone does not chip where the cord pulls across it.

Nephrite jade is a deep spinach green. Its fibres lock together, which makes it one of the toughest stones there is: it resists chipping better than quartz.

The cord is the same as on the wooden piece, so the solution is the same. We can cut it in rose quartz, amethyst, nephrite jade, lapis lazuli, black onyx, red jasper, tiger’s eye or smoky quartz.