The Journal
Understanding exceptional stones.
Monographs, expertise and heritage. What you need to know to choose a precious stone with full knowledge.
Expertise
Heated or unheated sapphire: what actually changes
Heating sapphires is an old, stable practice. What it changes, how laboratories detect it and why an unheated stone is worth more.
Read the article →How to read a laboratory report for a coloured stone
Identification, weight, treatment, origin: what an SSEF, Gübelin, GRS or GIA report contains, what it leaves out, and how to check it before you buy.
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