Gemstone Treatments: A Practical Buying Guide
Rokero Gems Editorial · Updated 4 October 2026
A buyer-focused guide to heating, clarity enhancement, filling, oiling, diffusion, irradiation and coatings.
Treatment does not automatically make a gemstone unacceptable. The important questions are what was done, whether it is disclosed and how it affects stability, care and price.
Heating is common for some gem species, while filling, oiling and coatings can have different durability and care implications.
Specific disclosure is more useful than a vague treated label.