TGL GemLab Sri Lanka unveils world’s first Cat’s Eye Xenotime in Kuruvita, Ratnapura

Sri Lanka makes history with a rare gemological breakthrough 

In a groundbreaking moment for the global gemstone industry, Sri Lanka has unveiled the world’s first known Cat’s Eye Xenotime, a remarkably rare mineral displaying a striking chatoyancy. Discovered in Kuruvita, Ratnapura, this extraordinary gemstone weighs 38.88 carats and exhibits a brownish-green hue with a distinct cat’s eye effect. The presence of chatoyancy in xenotime is an exceptionally rare phenomenon, making this find possibly the only one of its kind. The discovery has captivated gemologists worldwide, reinforcing Sri Lanka’s position as a premier source of rare and exquisite gemstones. 

The identification and classification of this gem were led by Dr. Kasun G. Madivila, DBA (USA), GG (GIA), Founder of TGL GemLab, Sri Lanka’s leading gemological laboratory. Further research was conducted at the Gem and Jewellery Research Centre in Kaduwela by Naleen Jayasinghe, adding significant scientific validation to the discovery. To confirm its authenticity and rarity, the gemstone has been sent for international verification to the International Mineralogical Association (IMA) and the Gemological Institute of America (GIA). If officially recognized, this cat’s eye xenotime will become a historic first in gemology. 

Xenotime is primarily composed of yttrium orthophosphate (YPO₄), with trace elements such as erbium, dysprosium, and ytterbium influencing its coloration and optical features. It crystallizes in a tetragonal structure, contributing to its stability and distinct properties. While xenotime is well known among mineral collectors, a cat’s eye variety has never been documented before making this discovery one of the most significant breakthroughs in gemology.  Additionally, some xenotime specimens can be weakly to strongly radioactive due to trace amounts of uranium and thorium in their composition. This characteristic adds another layer of scientific intrigue to the discovery, requiring further research into its potential effects and safe handling. 

Sri Lanka, particularly Ratnapura, has long been a global hub for rare gemstones. This latest discovery adds to the legacy of G.D. Nandana Edirisinghe, a veteran gem dealer and expert rough gem identifier, who has previously uncovered major gemstone finds, including the world’s largest serendibite and Sri Lanka’s first samarskite in over 160 years. The unveiling of the world’s first cat’s eye xenotime is a historic milestone in gemology, elevating Sri Lanka’s position as a leader in rare and exceptional gemstones. The scientific community and gem collectors worldwide eagerly await the final verification and classification of this unprecedented gemstone.

CAPTION

The 38.88-carat xenotime unearthed in Kuruwita, shown with and without reflected light