Gems Cleaning

Ultrasound:                            never.
Steam:                                    never.
Warm water and
           neutral soap:


Reaction to heat: sharp changes in temperature can lead to breaking, cracking, or fracturing of                                the opal, excessive heating can change a white opal to brown and remove the                                 colour effect.
Stability with light: relatively stable.
Reaction to chemical
agents:                   affected by hydrofluoric acid and corrosive alkalis.

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