Draft:Lengai Ruby
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Lengai Ruby The Largest Faceted Tanzanian Ruby
The Lengai Ruby is a 17.84-carat natural, unheated ruby from the Winza mine in Tanzania, recognized as the largest faceted ruby from Tanzania. Named after the Ol Doinyo Lengai volcano, a sacred site in Maasai culture, this gemstone is a rare and significant discovery in the world of fine rubies.
Discovery and Characteristics The Lengai Ruby was discovered in 2007 in the Winza mining region of Tanzania, a relatively recent but important source of high-quality rubies. It was subsequently examined and certified by GRS (GemResearch Swisslab) under Report No. GRS2021-057499, confirming its vivid red color (“Pigeon Blood”), exceptional transparency, and lack of thermal treatment.
Weight: 17.84 carats
Cut: Cushion
Color: Vivid Red (GRS-type “Pigeon Blood”)
Transparency: Exceptional clarity, no visible inclusions
Origin: Winza, Tanzania • Certification: GRS, SSEF
GRS noted that rubies of this size and clarity are almost never seen from Tanzania, making it an outlier in terms of both size and quality. The Winza deposit, from which it originates, is now fully depleted, increasing the gemstone’s rarity and investment appeal.
Comparison to Other Large Rubies The Lengai Ruby is often compared to other major faceted rubies in the world, such as: • The Sunrise Ruby (Burma, 25.59 ct) – Record-breaking sale at Sotheby’s for $30 million. • The Estrela de Fura (Mozambique, 55.22 ct) – Sold for $34.8 million in 2023.
Carmen Lúcia Ruby (Burma, 23.1 ct) – Displayed at the Smithsonian Museum. While Burmese and Mozambican rubies dominate the high-end market, the Lengai Ruby is the first and largest significant faceted ruby from Tanzania, positioning it as a key collector’s gemstone.
Market and Significance The Lengai Ruby has been linked to Louis Vuitton’s High Jewelry collection, further elevating its prestige. Given its size, clarity, and provenance, the gemstone is considered a landmark investment piece for collectors assembling a portfolio of historically significant rubies.
It is one of the few named Tanzanian rubies to receive independent recognition for its size and quality, further solidifying its place among the world’s most important gemstones.
See Also:
GemResearch Swisslab:
1. GRS Laboratory Report No. GRS2021-057499
2. SSEF Gemstone Report No. 106916 (if accessible online)
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