Amethyst and citrine are both forms of transparent quartz and are often found in the same location. Natural golden citrine is considered to be rarer than purple amethyst, and so it usually is more valuable. However, a very rare combination of both colors of quartz found in the same crystal is even rarer than golden citrine. Virtually all the world's supply of ametrine comes from a single mine in Southeastern Bolivia, known as the Anahi mine. Ametrine from Bolivia is considered by most to be the finest quality ametrine available today.
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Many beautiful gems on the site. Love that you are actually shipped the gem that is shown in the photos. Also cool that they give a write up of each gem detailing hardness, characteristics, and best uses for mounting. Great site! Looking forward to seeing these gems in person.