Articles
Articles & explainers
Shorter, focused pieces that answer a single question in depth — each linked back to the reference guides it draws on.
Buyer guide
How to Read a Copper-Bearing Tourmaline Lab Report
Species, variety, comments, treatment and origin — what each section of a report actually tells you.
Nomenclature
From Place Name to Variety: The History of “Paraíba”
Why “Paraíba” no longer means “from Paraíba” — and what that means for Ethiopian material.
Practical
Photographing Tourmaline Colour Accurately
Lighting, white balance and screens all distort neon blues. How to judge a stone you cannot see in person.