What Makes Opal Unique?
Opal is known for its distinctive play-of-colour, where flashes of spectral colour shift with viewing angle. Not every opal shows play-of-colour; common opal can display attractive body colours without it.
Common Opal Types
Precious opal may be described by body tone and origin, including black opal, white or light opal, boulder opal, and crystal opal. These labels describe appearance or structure and should be supported by an accurate seller description.
What Influences Opal Value?
Important factors include brightness and pattern of colour play, body tone, transparency, size, cut, stability, and whether the piece is solid opal, a doublet, or a triplet. Composite stones can be attractive, but buyers should know exactly what they are purchasing.
Natural, Treated, and Composite Opals
Some opals may be treated, and doublets or triplets combine opal with other materials. Ask for clear disclosure of construction and treatments. For a significant purchase, seek independent advice if the description is uncertain.
Opal Care
Opal care varies by type and construction. Avoid sudden temperature changes, harsh chemicals, and unapproved cleaners. Do not soak assembled doublets or triplets, as moisture can affect the layers or adhesive. Ask a specialist for guidance when unsure.
Buying Checklist
- View colour play under more than one angle and lighting condition.
- Confirm whether the piece is solid opal, a doublet, or a triplet.
- Ask about treatments and stability.
- Check for cracks, chips, or loose settings.
- Request clear return terms.
Frequently Asked Questions
Does every opal show rainbow colours?
No. Common opal may not show play-of-colour.
Can opal be cleaned in an ultrasonic machine?
Do not assume so. Opals and composite constructions can be vulnerable to damage.
