In 2004, Ross Chapman, a Fellow and registered tutor of the Gemmological Association of Great Britain (Gem-A), was working his way through a sorting table of rough gemstones in Bangkok. Thousands of stones passed through his hands. One did not pass.

The pebble was water-worn, transparent, and a deep purplish-blue. To an untrained eye it might have looked unremarkable. To Ross, with decades of experience identifying, sourcing, and cutting gemstones from around the world, it was immediately clear: this was something he had never seen before.

He bought the stone.

From a Thai Gem Sorting Table to the Natural History Museum

Back in his workshop, Ross cut the stone and carefully preserved the slivers of rough material. The fact that it was recovered from a rough gemstone sorting table in Thailand, handled by local miners, cut from natural rock, unsynthesised, established clearly that what he had found was a naturally occurring gemstone.

He sent a fragment to the Natural History Museum in London for scientific identification.

The NHM's analysis confirmed it: the stone was a gem-quality specimen of thortveitite, a mineral, but with a chemical composition unlike anything previously recorded in a natural gemstone. Its scandium oxide concentration measured approximately 52.9%, far exceeding any known natural sample. The stone displayed strong pleochroism, shifting colour depending on the viewing angle, and was faceted into a 10.01-carat gemstone of exceptional clarity.

The Natural History Museum co-authored the findings with Ross and they were published in the Journal of Gemmology, the peer-reviewed publication of the Gemmological Association of Great Britain.

The stone was named Deep Thought. (If you are a fan of Douglas Adams work, you will know!)

Why This Discovery Matters

New gemstone discoveries are extraordinarily rare. The gemological world operates on centuries of accumulated knowledge, and the identification of an entirely new gemstone species is a significant scientific event, not just a curiosity.

What makes Deep Thought exceptional:

• It is the only known specimen. In the years since its discovery and publication, no other gem-quality thortveitite of this composition has surfaced anywhere in the world. Deep Thought is not merely rare. It is, as far as the scientific community knows, unique.
• It was authenticated by one of the world's foremost scientific institutions. The Natural History Museum, London, is the global authority on mineralogy and natural history. Their co-authorship of the research paper is the highest possible endorsement of the stone's authenticity and significance.
• It was published in peer-reviewed literature. The Journal of Gemmology is the leading scientific publication in the field of gemology. Publication there represents independent expert scrutiny and verification of the discovery.
• It was found by a practising gemologist of the highest standing. Ross Chapman's qualifications as a Fellow and tutor of Gem-A, the Gemmological Association of Great Britain, founded in 1908 and the world's leading gem education body, mean he was uniquely positioned to recognise what he was looking at. The discovery was not luck. It was expertise.
  

The Expert Eye Behind Lurlina

Ross Chapman is the gemological heart of Lurlina Gemstones. Every stone we sell is either mined or sourced, assessed, and cut by Ross, a Fellow and registered tutor of Gem-A whose knowledge spans decades and continents.

He is the reason that when you buy from Lurlina, you are buying something real.

The Deep Thought discovery is perhaps the most dramatic illustration of what that expertise looks like in practice: the ability to recognise, on a rough sorting table in Thailand, that a single water-worn pebble was something the world had never catalogued before.

That same eye shapes every piece in the Lurlina collection.

Further Reading

The original research paper, Thortveitite: a new gemstone, was co-authored by R. Chapman and published in the Journal of Gemmology by the Gemmological Association of Great Britain. It is available through Gem-A's journal archive.

Read the Journal of Gemmology paper →

Lurlina Gemstones is a family-owned Australian gemstone jewellery business, built on a love of real stones, genuine provenance, and the belief that fine jewellery should be accessible without compromise.