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BYTOWNITE -- Mexico
Hardness -- 6 to 6.5
Specific Gravity -- 2.74 to 2.76
Refractive Index -- 1.565 to 1.585
Calcium sodium aluminum silicate -- Ca(70-90%) Na(30-10%) (Al, Si)AlSi2 O8

Bytownite is a sub-group of Plagioclase, a variety of Feldspar. The yellow color of this mineral is very pleasing and although the Refractive Index is fairly low (1.56 to 1.58), gems cut from clean material are unusually bright and lively. Bytownite gems have gained a lot of popularity recently. If you are interested in buying any of these beautiful gems, please contact me with an offer.

BYTRIB01 - 31.25carats - 23MM - 70Facets - Magnificant Mexican Bytownite Tribble cut collectors gemstone ($935.00)
BYTRIB001 - 31.25Carats - 23 mm - 70 Facets 
This is a magnificent large Mexican Bytownite collectors gemstone. I recently cut it from a loupe clean piece of rough that was over 21 Grams. It is a very unique Triangle Brilliant 'TRIBBLE' cut that makes for an extremely bright and lively gem. The meets are exact and the polish is perfect.
BYT069 - 7.23Carats - 12.0MM - 105Facets - Beautiful Mexican Bytownite 'Square Cushion Barion' collectors gemstone ($180.00)
BYT069 - 7.23Carats - 12.0 mm - 105 Facets 
This is beautiful large and extremely well cut and loupe clean Mexican Bytownite. I cut it as a very bright and lively 'Square Cushion Barion'. The crown is unique having fan shaped facets at the corners. The meets are exact and the polish, done on a 'SPECTRA' Ultralap is perfect. This stone would make any collector of exquisite rare gems very happy indeed!
BYT101 - 17.00Carats - 15MM - 97Facets - Beautiful Mexican Bytownite 'Square Cushion Barion' collectors gemstone ($425.00)
BYT101 - 17.00Carats - 15 mm - 97 Facets 
This is a beautiful large and extremely well cut and loupe clean Mexican Bytownite. I cut it as a very bright and lively 'Square Cushion Barion'. The meets are exact and the polish, done on a 'SPECTRA' Ultralap is perfect. This stone would make any collector of exquisite rare gems very happy indeed!
BYT109 - 7.74Carats - 9.4 X 15.7MM - 69Facets - Beautiful Mexican Bytownite 'Emerald Split Facet Barion' collectors gemstone ($190.00)
BYT109 - 7.74Carats - 9.4 X 15.7 mm - 69 Facets 
This is a beautiful large and extremely well cut and loupe clean Mexican Bytownite. I cut it as a very bright and lively 'Emerald Split Facet Barion'. The meets are exact and the polish, done on a 'SPECTRA' Ultralap is perfect. This stone would make any collector of exquisite rare gems very happy indeed!

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Last updated - 09/02/2010