Posted 7 years ago
Sibyl Dunlop sterling ring set with a large oval ametrine surrounded by fire opals, chalcedony and chrysoprase. In its original box marked Sibyl Dunlop 69 Church Street, Kensington W.8 (London)
Ametrine, also known as trystine or by its trade name as bolivianite, is a naturally occurring variety of quartz. It is a mixture of amethyst and citrine with zones of purple and yellow or orange. Almost all commercially available ametrine is mined in Bolivia.