description Blue Spinel Overview
Blue spinel is a naturally occurring magnesium aluminum mineral prized as a gemstone for its vitreous luster and durability. Its blue coloration is caused by the presence of trace elements, primarily iron and cobalt, with cobalt-dominant stones often exhibiting highly sought-after vivid blue hues. Significant sources of blue spinel include Sri Lanka, Myanmar, and Vietnam. Because it possesses a similar color and high refractive index to sapphire but is frequently found in nature without the need for heat treatment, it is utilized by jewelers as a natural alternative center stone.
insights Ranking position
Blue Spinel ranks #33 of 202 in the Gemstone ranking, behind Color Change Sapphire, ahead of Opal.
help Blue Spinel FAQ
What causes a spinel to appear blue?
Blue color in spinel usually comes from trace iron, while unusually vivid cobalt-blue material owes its color largely to cobalt. Cobalt-rich stones from Vietnam are especially sought after by collectors.
How can blue spinel be distinguished from blue sapphire?
Spinel is singly refractive, whereas sapphire is doubly refractive and belongs to the corundum family. A gemologist can separate them using refractive-index readings and other laboratory tests rather than color alone.
Is natural blue spinel commonly heat-treated?
Spinel is less routinely treated than sapphire, and many stones reach the market without heat treatment. Buyers should still request a laboratory report for an expensive gem because synthetic spinel and other blue lookalikes exist.
Where does gem-quality blue spinel come from?
Important sources include Sri Lanka, Myanmar, Tanzania, and Vietnam. Vietnam is particularly associated with vivid cobalt-blue spinel from deposits such as Luc Yen.
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