A Deeper Look into the Invisible: Mastering Gemstone Origin Determination at SSEF - LEYSER Skip to main content
A Deeper Look into the Invisible: Mastering Gemstone Origin Determination at SSEF
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A Deeper Look into the Invisible: Mastering Gemstone Origin Determination at SSEF

By December 9th, 2025No Comments

Introduction: Unveiling the Gemstone’s True Story

A deeper look into the invisible. Origin Determination 3.0 — analysing inclusions, trace elements and the geological clues that reveal a gemstone’s true birthplace. Honoured to continue learning, refining and elevating our craft.

For those of us dedicated to fine jewelry and ethical sourcing, understanding the where is just as critical as understanding the what. The journey of a gemstone, from its genesis deep within the earth to its setting in a final masterpiece, demands absolute transparency.

I recently had the privilege of attending the Advanced Coloured Stones course at the world-renowned SSEF Swiss Gemmological Institute in Basel. The course, led by esteemed experts including the Director of SSEF, Dr. Michael S. Krzemnicki, was an intensive, hands-on opportunity to delve into the most complex and critical aspect of gem identification today: Origin Determination 3.0.

The Science Behind Origin Determination

The difference between a ruby from Mogok and one from a different locality can mean immense variations in rarity and value. This course went far beyond basic identification, focusing on the multi-disciplinary techniques used by leading labs to make definitive origin calls.

  1. Inclusion Analysis: Geological Clues

This discipline is about “reading” the microscopic geological clues—the fingerprints—trapped within the crystal lattice. These tell-tale signs are often the most direct link to a stone’s specific formation environment.

Gemologist uses a specialized darkfield and fiber-optic light source on a high-power microscope to study a mounted coloured stone's internal features (inclusions) for origin determination at the SSEF Swiss Gemmological Institute.

  1. Trace Element Chemistry

Understanding the fundamental chemistry is paramount. We utilized advanced methodologies to analyse the minute concentrations of trace elements (like iron, chromium, and vanadium) within the crystal. These unique ratios act as a reliable chemical signature, helping to distinguish, for example, a high-value sapphire from its geological counterparts.

Informational display board at SSEF showing the crystal structure (molecular model) and key properties—chemical formula ($\text{Al}_2\text{O}_3$), Birefringence, and Chromophore—of Ruby and Sapphire (Corundum).

The Geography of Rarity: Famous Origins

The training covered the distinct features of some of the most legendary gem localities on Earth. Under the instruction of experts like Dr. Michael S. Krzemnicki, we gained detailed insights into:

  • Sapphires: Analysing the specific characteristics of the coveted Kashmir sapphire and those from famous sources like Sri Lanka.
  • Rubies: Understanding the unique mineral and chemical fingerprint of stones from Mogok (Burma).
  • Emeralds: Learning to differentiate between material from Muzo (Colombia) and the striking African crystals, like Sandawana and the high-quality stones of Zambia.
  • Aquamarines: The distinct features of gems from the famous Santa Maria mine.

Dr. Michael S. Krzemnicki, Director of SSEF, lecturing on the unique geological and optical properties of Kashmir Sapphire during the Advanced Coloured Stones course.

Practical Application: Verifying Our Own Stones

The course provided the opportunity for practical application on real-world inventory. We analysed some of our own fine inventory, including a beautiful Zambian Emerald.

The course provided the technical skills needed to confidently verify its characteristics, confirming that its beautiful colour and clarity were enhanced only by an insignificant amount of oil treatment. Verifying “insignificant oil” status is the gold standard for minimal enhancement in the emerald trade and ensures the stone’s integrity, reinforcing our commitment to using verified, No Heat (where applicable), and minimally-treated gems.

Microscopic view of a LEYSER bespoke Zambian Emerald, showing characteristic inclusions and growth features, verified as having only insignificant oil treatment at the SSEF lab.

Elevating Our Craft: A Legacy of Expertise

The SSEF Advanced Coloured Stones course is not just professional development; it is a vital step in maintaining the integrity of our craft. This advanced knowledge ensures we can confidently verify the provenance of stones for our clients, guaranteeing the integrity and value of every piece we create.

This pursuit of scientific knowledge is the modern expression of a multi-generational commitment. From the late 1890s, when my Great-Grandfather, Otto Leyser, mined fine stones at Santa Maria, the LEYSER name has always been synonymous with deep expertise and passion for coloured stones.

LEYSER bespoke legacy: SSEF Advanced Coloured Stones Certificate and the Santa Maria mining history of Otto Leyser, demonstrating a multi-generational commitment to gemstone sourcing and advanced gemology.

Today, this latest certification from the SSEF ensures that we are not only honouring that history but are also mastering the cutting-edge science needed to verify every From Mines To Masterpieces piece we create. We are committed to absolute transparency, integrity, and verified origin for the next generation of clients.

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What questions do you have about the origin or history of your own cherished gemstone? Contact us today to learn more about our commitment to verifiable, ethical, and beautiful coloured stone jewelry.