Opal is one of nature’s most enchanting gemstones, revered for its mesmerising play-of-colour and unique patterns. Often referred to as the “queen of gems”, opal is beloved not only for its beauty but also for its individuality — no two opals are ever truly the same.
What is Opal?
Opal is a silica-based gemstone that contains water within its structure. Its most distinctive feature is the play-of-colour — an optical effect where flashes of rainbow-like hues appear when the stone is moved under light. This effect is caused by microscopic silica spheres that diffract light.
The majority of the world’s opals come from Australia, though deposits are also found in Ethiopia, Mexico, and Brazil. Opals occur in a variety of base tones, including white, blue, grey, orange, and black. Black opals are especially rare and are prized for their depth and vivid colour display.
Types of Opal
Collectors often differentiate opals by their type, which affects value, rarity, and care:
- Black Opal: The rarest and most valuable; dark body tone enhances colour play.
- White or Light Opal: More common; has a pale body colour with soft flashes.
- Boulder Opal: Found in ironstone rock; retains parts of the host rock in the gem. Durable and striking.
- Crystal Opal: Transparent to translucent with vivid play-of-colour; highly prized.
- Ethiopian Opal: Often hydrophane (absorbs water), making it behave differently than Australian opals.
- Fire Opal: Usually orange to red, found mainly in Mexico. Some have colour play, others do not.
Common Patterns in Opals
Each opal is unique, but many exhibit recognisable patterns:
- Harlequin: A rare pattern made up of defined, block-like patches of colour.
- Pinfire: Small, scattered dots of colour across the surface.
- Flame: Curving patterns that resemble flickers of fire.
- Broad Flash: Large areas of colour that appear and disappear as the stone is turned.
- Rolling Flash: A band of colour that glides across the stone with movement.
These natural patterns make every opal truly one of a kind.
What Affects an Opal’s Value?
The value of an opal is determined by several key factors:
- Play-of-Colour: The brightness, variety and intensity of colour.
- Pattern: Rare patterns such as harlequin or rolling flash can significantly increase value.
- Body Tone: Darker stones often offer more striking contrast.
- Transparency: Crystal opals with strong colour are particularly collectable.
- Origin: Opals from iconic locations like Lightning Ridge in Australia are highly prized.
Caring for Opal Jewellery
Opal is softer than many other gemstones, with a rating of 5.5 to 6.5 on the Mohs hardness scale. With the right care, it can remain beautiful for many years.
Tips for looking after your opal jewellery:
- Avoid exposure to strong chemicals such as cleaning products and perfumes.
- Protect from sharp temperature changes, which can cause cracks.
- Store separately from harder gemstones to prevent scratches.
- Clean with a soft, damp cloth. Avoid ultrasonic and steam cleaners.
Composite opals, such as doublets or triplets, require extra care. Prolonged exposure to water may cause these layered stones to separate, so it’s best to keep them dry.
A Natural Wonder
With its ethereal glow and ever-changing colour, opal is a gemstone that never fails to draw attention. Whether you’re choosing a piece for yourself or as a gift, opal offers something truly special — a piece of jewellery as unique as the person who wears it.
Discover our collection of opal designs at Fei Liu Fine Jewellery, where each piece is thoughtfully crafted to celebrate the natural charm of this remarkable stone.
