Cristalized stones are very facinating to me. almost as beautiful as a brilly maybe more. 

Cristilazid white agate in 750 Au on a CHANGE base ring made of 750 Au. Kristallisierter weißer Achat gefasst in 750er Gelbgold aufgezogen auf die CHANGE Basisringschiene aus 750er Gelb-gold.

Here you can clearly see the different components of CHANGE. The base ring and the ringheads with black and white cristilazed agate. To stabilize the ring heads you can use rubber o-rings. 

A cristalized calcedon put into 750 Au. The material warms up the colour of the stone.