Russian alexandrite is alexandrite from the original type locality in the Ural Mountains east of Yekaterinburg, where the colour-change variety of chrysoberyl was first identified in 1834 and named for the future Tsar Alexander II. Although the productive life of the historic Ural deposits was effectively ended within decades of discovery and the great majority of alexandrite in modern commerce now originates from Brazil, Sri Lanka, Tanzania, India, and Madagascar, Ural-origin alexandrite continues to set the gemmological benchmark for the species. The strongest, cleanest examples of the daylight-green to incandescent-red colour change come from the Ural deposits, and the trade premium for Russian-origin alexandrite supported by laboratory documentation runs from a substantial multiple over comparable Brazilian or East African material to extraordinary levels for stones above a few carats.

Discovery and history

The classic account holds that alexandrite was first noticed by the Finnish mineralogist Nils Gustaf Nordenskiöld in material recovered from the emerald workings near the Tokovaya River in the Urals in 1834. The colour change — green in daylight, red in the candlelight of the period — and the date of discovery near the future Tsar's birthday led to the species being named for him. The Ural deposits, worked alongside the local emerald mines through the nineteenth century, supplied the Imperial court and the European trade with most of the alexandrite in circulation at the time. Production declined through the late nineteenth and early twentieth centuries, and significant new finds in the Urals are rare in the modern era.

Gemmological character

Ural alexandrite is distinguished gemmologically by the strength and purity of its colour change. The chromium content responsible for the colour change is matched by a comparatively low iron content, which keeps the daylight green clean and unmuddied by brown or olive overtones; the red under incandescent light is correspondingly saturated rather than wine-coloured or pinkish. Inclusion populations and trace-element fingerprints established by laboratories — GIA, Gübelin, SSEF, and AGL among them — distinguish Ural material from later sources and underpin laboratory origin reports. The specific gravity, refractive indices, and optical properties of Ural alexandrite are within the species range and are not by themselves diagnostic of origin.

The trade premium

For stones above approximately one carat with strong colour change and good clarity, Russian-origin alexandrite commands a premium of approximately 50 to 200 percent over comparable Brazilian or East African material at retail; the multiplier rises sharply for stones above three to five carats and reaches multiples of ten or more for the finest historical Ural specimens at auction. The premium is supported by the species type-locality status, the rarity of the material in modern commerce, and the consistent strength of the colour change in well-documented Ural pieces. Stones without laboratory documentation cannot capture the Russian-origin premium, and the trade routinely commissions reports from GIA, Gübelin, or SSEF for any significant alexandrite where origin is in question.

Identification and authentication

Modern laboratories distinguish Ural alexandrite from later sources by a combination of inclusion microscopy and trace-element analysis using LA-ICP-MS or similar techniques. The combination of low iron, the characteristic chromium and vanadium signature, and the inclusion suite — fluid-inclusion patterns, mineral inclusions consistent with the Ural geology — produces a confident origin attribution for stones with adequate sample features. Heat treatment is uncommon in alexandrite, and the trade addresses treatment status as part of any laboratory report.

In the trade

For dealers and collectors, Russian-origin alexandrite is a category in which laboratory documentation is essentially mandatory. Stones offered as Russian without a report from a recognised origin-issuing laboratory are treated with appropriate caution, and the difference in market value between a stone with and without origin documentation is frequently larger than the cost of the report several times over. See also Russian alexandrite effect, alexandrite, and chrysoberyl.

Further reading

• GIA Gems & Gemology — alexandrite origin determination
• International Gem Society — alexandrite reference
• ICA — alexandrite