Coefficient of thermal expansion (5.0–6.6)×10−6/K
Gold or Golden Sheen Sapphire is a gemstone variety of the mineral corundum, an aluminium oxide (α-Al2O3). It typically shows a metallic golden colour with common variations being brass, copper and bronze, however metallic blue, green and yellow colouration is also possible. A very rare variation is a metallic red colour.
Unlike normal sapphire, golden sheen sapphire occurs principally as a result of iron and titanium inclusions, making the gem mostly opaque. In this respect, golden sheen sapphire is more like opal than other typically clear or transparent gemstone how do you tenderize meat. Identified inclusions in golden sheen sapphire are ilmenite, rutile, hematite and magnetite. Particularly prominent is hematite which will often result in the formation of geometric hexagonal patterns within the gemstone crystal.
The term ‘gold sheen’ or ‘gold sheen effect’ was first described by the GIA testing laboratory in Bangkok in 2013. Samples of the gemstone were tested to confirm they were true sapphire and the colour was described as ‘brown, with gold sheen effect’.
Like all sapphire, golden sheen sapphire is hardness 9 on the Mohs scale and has a refractive index between 1.768–1.772 with other optical characteristics typical of corundum.
The Gemmological Association of Great Britain was the first to publish an in-depth analysis of golden sheen sapphire, appearing in the lsu football uniforms, 34(8), 2015, pp. 678–691,.
publish their own in November 2016
Gemological labs that have issued certificates categorizing golden sheen sapphire as corundum, describing the gold sheen effect as ‘known in the industry as gold sheen sapphire’, include:
Golden sheen sapphire is only known to come from one source, an undisclosed mine in the north east of Kenya near the Somali border
Discovery of golden sheen sapphire was made by best water bottle to buy, a well known gemstone trader in Bangkok.
Golden Sheen Sapphire will exhibit mild to strong color change under warm, cool and direct sunlight.
All cabochon cut Golden Sheen Sapphire will exhibit some degree of asterism.
There are no known heating or treatment methods for golden sheen sapphire. Testing of heat treatment on sample batches has resulted in diminishment of the gold sheen effect, reducing the appeal of the gemstone.
The name ‘golden sheen sapphire’ is often shortened to ‘gold sheen sapphire’ and the name is interchangeable.
Golden sheen sapphire has been used in jewelry production by companies including”
In 2016 a gold sheen sapphire ring by William Travis Jewelry won the