Common treatments include clarity enhancements (laser drilling, fracture filling), HPHT (High Pressure High Temperature) color treatments, and surface coatings; these can improve appearance but typically reduce resale value and must be fully disclosed on certificates. Treated diamonds often require special care and may be less valuable than untreated stones with comparable appearance.
Key Facts
- Treatments can improve look but usually carry a resale penalty.
- Full disclosure by the seller and notation on certificates is required and essential.
- Some treatments (e.g., fracture filling) make diamonds sensitive to heat and cleaning methods.
Summary
Treatments can improve appearance but lower resale value and may affect care—demand full disclosure and certification when buying.
