Gemstone
Education
The vocabulary behind the trade. What the terms mean, what the labs measure, and what the language quietly leaves out.
Learn the language of the trade
Gemstone education without the sales pitch. These guides explain what unheated really means, how to read a laboratory certificate, and why colored stone grading inverts the diamond four Cs you already know.
What Unheated Means
Heating is the trade’s quiet open secret. Here is what it actually does and why the unheated supply keeps shrinking.
Read the guideHow to Read a Gemstone Certificate
A laboratory report looks more authoritative than it is. What GIA, AGL, SSEF, and Gübelin establish, and what they leave out.
Read the guideColor, Clarity, Cut
The four Cs were built for diamonds. Applied to colored gemstones the priorities reverse and the vocabulary changes.
Read the guidePadparadscha
The rarest commercial variety of sapphire and the most particular. The lotus blossom standard and why Sri Lankan origin matters most.
Read the guideExplore the rest of the editorial
