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Lot 1216
Quartz var. Ametrine--"A Member of the 100 Carats Club", Ex. Ed Swoboda Collection
26 – 27 October 2020, 11:00 PDT
Los AngelesSold for US$637.50 inc. premium
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Quartz var. Ametrine--"A Member of the 100 Carats Club", Ex. Ed Swoboda Collection
Anahi Mine, La Gaiba Amethyst District, Sandoval Province, Santa Cruz Department, Bolivia
Ex. Swoboda Collection
Ametrine, sometimes also known in the trade as Bolivianite, is a naturally occurring variety of quartz. A mixture of amethyst and citrine, with zones of purple and yellow or orange, almost all commercially available ametrine is mined in Bolivia. The color of the zones visible within ametrine are due to differing oxidation states of iron within the crystal a result of there being a temperature gradient across the crystal during its formation. The present stone is a large circular-cut ametrine exhibiting excellent color zoning of bright citrine and rich violet, RHC8308. Weighing approximately 154.5 carats and measuring 35.89 x 24.16 mm
Ex. Swoboda Collection
Ametrine, sometimes also known in the trade as Bolivianite, is a naturally occurring variety of quartz. A mixture of amethyst and citrine, with zones of purple and yellow or orange, almost all commercially available ametrine is mined in Bolivia. The color of the zones visible within ametrine are due to differing oxidation states of iron within the crystal a result of there being a temperature gradient across the crystal during its formation. The present stone is a large circular-cut ametrine exhibiting excellent color zoning of bright citrine and rich violet, RHC8308. Weighing approximately 154.5 carats and measuring 35.89 x 24.16 mm
Footnotes
With a paper label:
RHC8308:
Acquired 2012, Miniature, 31 gm.
A big round brilliant cut stone. Got the specimen as part of the tons of cutting rough and specimens that I hauled out of Ed Swoboda's house over the period of about a year. Ed was a manufacturing jeweler and promoter of mining ventures and had accumulated this material over a period of decades. Got the stone as a preform and had to have it cut.