Entry
CommercialPrice index101.0▲ 0.2% qtr
Q1 2025Q2 2026
Example grade (e.g.)India / BrazilPale violetish blueSI clarity · Untreated< 2 ct
Market band$15 to $20 / ct
The Gemius IndexIOL
Iolite
Four market segments for iolite, Entry to Investor. Each shows its price index, market band and an example grade. Refreshed every quarter.
By market segment
Where a iolite lands depends on its origin, colour, clarity, treatment and size.
Mid
GoodPrice index103.0▲ 0.8% qtr
Q1 2025Q2 2026
Example grade (e.g.)Sri Lanka / TanzaniaSaturated violet-blueVS clarity · Untreated2 – 5 ct
Market band$30 to $50 / ct
Premium
Fine · HeadlinePrice index106.0▲ 1.4% qtr
Q1 2025Q2 2026
Example grade (e.g.)Sri LankaVivid violet-blueVVS clarity · Untreated5 – 10 ct
Market band$50 to $80 / ct
Investor
Extra-FinePrice index107.0▲ 1.7% qtr
Q1 2025Q2 2026
Example grade (e.g.)Sri LankaDeep violet-blue (water sapphire)VVS clarity · Untreated10 ct +
Market band$100+ / ct
Price index base 100 at Q1 2025. Market band is the per-carat range across the segment. Example grades are illustrative, not an offer to buy or sell. As of Q2 2026.
Other gems
See the market data for any other species we cover.
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AlexandriteColor change · RussiaAmberOrganic · BalticAmethystPurple quartz · UruguayAmetrineBicolor quartz · BoliviaAquamarineBeryl · blueCitrineYellow quartzEmeraldBeryl · ColombiaGarnetMulti-variety · pyrope to demantoidJadeiteImperial green · MyanmarKunziteSpodumene · pinkMoonstoneAdularescence · feldsparMorganiteBeryl · pinkOpalPlay of color · AustraliaPeridotOlivine · PakistanRubyHardness 9 · red corundumSapphireHardness 9 · blue corundumSpinelHardness 8 · unheatedSunstoneAventurescence · OregonTanzaniteZoisite · Tanzania onlyTopazImperial · BrazilTourmalineMulti-color · elbaiteZirconHigh dispersion · Cambodia