Iolite market statistics

Iolite

Color: blue, violet-blue Hardness: 7 - 7.5 Refractive index: 1.52 - 1.56 Density: 2.53 - 2.78 Chemical composition: Mg2Al3(AlSi5O18) Crystal structure: orthorhombic Origins: Brazil, USA, Canada, Madagascar, Sri Lanka, India, Burma. Iolite (dichroite, water sapphire) has a significant pleochroism effect (from violet-blue to colorless or yellowish). Stones are generally not treated.

Iolite 8.30 cts. Published under permission: Miguel Angel Lopez

The figures are based on Gemval's aggregated valuation statistics for the retail market. Irrelevant, controversial or repeat data are excluded from our analysis wherever possible. The figures are updated monthly.

Weight distribution for Iolite

Occurrence is represented in % for different weight categories.

Price distribution for Iolite

Occurrence is represented in % for different value intervals.

Clarity distribution for Iolite

Occurrence is represented in % for different clarity grades.

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