AltGems
Updated as of June 2026

How to clean and care for Grandidierite

Reviewed by the AltGems editorial team · Updated June 2026

Durable but can be cleaved. Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners and hard knocks.

Step by step

  1. Fill a bowl with warm water and a few drops of mild dish soap.
  2. Soak the piece briefly, then gently brush with a soft toothbrush. Reach behind the stone where buildup hides.
  3. Rinse in clean water (keep a strainer over the drain) and pat dry with a lint-free cloth.
  4. Store in a soft pouch away from harder gems that could scratch it.
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Frequently asked questions

How do you clean Grandidierite?
Durable but can be cleaved. Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners and hard knocks.
Can you use an ultrasonic cleaner on Grandidierite?
No. Grandidierite can be damaged by ultrasonic or steam cleaners. Stick to warm soapy water and a soft cloth.
Does Grandidierite scratch easily?
Grandidierite rates 7.5 on the Mohs scale. That is moderately hard; avoid storing it loose with harder gems.