30/06/2025
Steps for Re-Polishing Lapis Lazuli:
1. Sanding:
Start with wet sanding using 2000 grit sandpaper, gradually increasing the grit to 4000-6000, says a Reddit thread.
This removes scratches and prepares the surface for polishing.
2. Initial Polishing:
Use cerium oxide polishing compound on a leather wheel or muslin buff.
Add a little vinegar to the cerium oxide and water mixture for a better polish, says a forum thread.
This step brings up a good shine.
3. Final Polishing (Optional, for finer results):
For a deeper luster, especially with medium to coarse-grained lapis, use diamond polishing compounds.
Start with 50,000 grit and then 100,000 grit, recommends a forum thread.
These finer grits help remove any remaining scratches and enhance the shine.
4. Cleaning:
After polishing, clean the lapis lazuli with warm, soapy water.
Test a small, inconspicuous area first, as some dye treatments may not be stable, notes the Gemological Institute of America (GIA).
Avoid prolonged exposure to water as it can be absorbed by the porous stone.
5. Gentle Wiping:
Gently wipe the surface with a soft, 100% cotton cloth dampened with warm water.
Avoid materials like georgette.
Important Considerations:
Lapis is a relatively soft stone, so avoid using harsh chemicals or ultrasonic cleaners, {says a jewelry blog https://www.argent-asher.com/blogs/news/lapis-jewelry-care-101-keeping-your-gemstone-gleaming} and the GIA.
Be cautious when working with lapis that has been dyed, as the color can be sensitive to chemicals and moisture, notes GIA.
Protect lapis from sharp impacts, pressure, and extreme temperature changes, as it is prone to damage along its weaker planes, says The Natural Gemstone Company.
