GEMSTONE ENCYCLOPEDIA
Opal
Many opals display changing flashes of colour known as play-of-colour, while other varieties are more uniform. Their relatively modest hardness means that jewellery design, water e...
ColourVarious, often iridescent
Mohs hardness5.5–6.5
Mineral familyHydrated silica
BirthstoneOctober
What is Opal?
Many opals display changing flashes of colour known as play-of-colour, while other varieties are more uniform. Their relatively modest hardness means that jewellery design, water exposure, cleaning methods and protective storage need particular attention. Doublets, triplets and treatments must be disclosed for individual items.
History and cultural context
Opal has inspired many stories through its colour effects. Those associations are cultural narratives rather than guarantees of fortune, healing or personal outcomes.
Colour and appearance
Various, often iridescent
Traditional meaning and symbolism
Often associated with imagination
Jewellery suitability
Choose the style and setting to suit the specific stone, treatment information and intended use.
Caring for Opal
Treat gently and avoid heat, impact, harsh chemicals and rapid temperature changes. Ask a specialist about cleaning if the material is assembled or treated.
Cleaning guidance
Treat gently and avoid heat, impact, harsh chemicals and rapid temperature changes. Ask a specialist about cleaning if the material is assembled or treated.
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References and further reading
- https://www.gia.edu/gem-encyclopedia
Traditional meanings are cultural associations, not proven medical benefits.