Opal

Semi-Precious · Hydrated Silica

The stone of inspiration — every colour of the spectrum lives within.

• Inspiration
• Creativity
• Spontaneity
• Transformation
• Emotion
• Rainbow

Opal is unique among gemstones — it displays 'play of colour' (fire), an extraordinary optical phenomenon where rainbow colours flash and shift as the stone moves. This comes from the diffraction of light by silica nanospheres arranged in a regular pattern within the stone. Ancient Romans considered it the most precious of all gemstones. The name comes from the Sanskrit 'upala' meaning precious stone.

Healing

Depression, Emotional Suppression, Creativity Blocks, Anxiety, Self-expression

Everyday uses

Prized as a gemstone for over 2,000 years — ancient Romans paid extraordinary prices for opal. Australia's national gemstone — the Lightning Ridge black opal is among the world's most valuable opals. Scientific research: opal's nanostructure has inspired the study of photonic crystals and applications in optical computing. Opal structures are studied for development of structural colour in materials — colour without pigment, as in butterfly wings. October birthstone.

Spiritual meaning

Opal is the stone of inspiration, creativity, and the full spectrum of human emotion. It amplifies emotional states and encourages spontaneous expression — powerful for those who have suppressed their feelings and developed depression as a result. It awakens creativity, brings suppressed feelings to the surface for healing, and inspires original, authentic self-expression.

Formation

Opal forms at low temperatures from silica-rich groundwater that percolates into cavities in rock, depositing silica gel that hardens over millions of years. The play of colour in precious opal comes from its internal structure of uniformly-sized silica nanospheres arranged in a regular lattice — when these spheres are the right size and spacing, they diffract visible light into spectral colours.

Where it is found

Australia produces over 95% of the world's precious opal — Lightning Ridge (black opal), Coober Pedy (white opal — the world's largest opal-mining town), and Andamooka are famous sources. Other sources include Ethiopia (Welo opal), Mexico (fire opal — orange to red), Brazil, and USA (Nevada, Oregon).

Zodiac

Cancer, Libra, Scorpio, Pisces

Chinese element

Rabbit, Goat, Dragon, Horse