Cut in 1986, this sensational quartz slice from South Africa was mined as part of a large deposit. Naturally occurring watermelon tourmaline crystals formed throughout the icy clear quartz, and some of the slabs cut from the prolific rough were large enough to become tabletops. 

18k yellow gold 
Quartz, 68.5ct, 37mm x 50mm x 5mm 
Chain is 18" long