Opal
About Opal
Unlike most gemstones, Opal is not a crystalline mineral but a mineraloid — hydrated amorphous silica containing anywhere from 3% to 21% water within its structure. Its defining feature is 'play-of-colour', a shifting rainbow flash created when light diffracts through a microscopic grid of tiny silica spheres inside the stone — an optical effect found in no other gemstone. At 5.5 to 6.5 on the Mohs hardness scale, Opal is notably softer and more delicate than most Navratna gems, and its water content means it needs distinct care from other stones.
Regional & Sanskrit Names
Dudhiya Pathar or Doodhiya Pathar (Hindi, meaning 'milky stone'), Upal (Sanskrit), and Shukra Ratna (gem of Venus) — the same title shared with Diamond, as both represent the same planet.
Unique Facts
- Opal's 'play-of-colour' is entirely different from the chatoyancy of Cat's Eye or the asterism of Star Sapphire — it is caused by light diffraction through an internal silica lattice rather than fibrous inclusions.
- Ethiopian Opal is often 'hydrophane', meaning it can absorb water and temporarily change appearance — a distinctive trait not shared by the more stable Australian Opal.
- Opal and Diamond are the only two Navratna gemstones assigned to Venus, giving buyers a choice between Diamond's brilliance and Opal's more accessible price and striking play-of-colour.
Origin & Sources of Opal
Australia (Coober Pedy, Lightning Ridge, Andamooka)
The most prized and widely recommended origin for astrological use, valued for stability and durability. Australian mines produce White Opal, the rare and highly valuable Black Opal, and Boulder Opal.
Ethiopia (Welo Province)
A major modern source known for vivid, intense play-of-colour at accessible prices; much Ethiopian Opal is hydrophane and requires more careful handling around moisture.
Mexico
Known for Fire Opal, a transparent orange-to-red variety, sometimes without play-of-colour.
Only Natural Gemstones sources Opal primarily from Australia and Ethiopia, with every stone accompanied by a laboratory certificate confirming natural, solid origin.
Benefits of Wearing Opal
Astrological Benefits
As a gemstone of Shukra (Venus), natural Opal is believed to
- Strengthen love, romance and marital harmony
- Enhance creativity, artistic expression and personal charm
- Support financial prosperity and worldly comfort
- Improve confidence and social standing
- Deepen emotional bonds and harmony in relationships
- Strengthen a weak or afflicted Venus in the birth chart
Healing & Wellness
Opal is traditionally associated with emotional balance and physical vitality.
Zodiac Association
Opal is traditionally linked to the Taurus (Vrishabha) and Libra (Tula) zodiac signs, both ruled by Venus, and is also recognised as a modern birthstone for October.
Who Should Wear Opal
By Zodiac Sign (Rashi)
Most beneficial for Taurus (Vrishabha) and Libra (Tula) moon signs, the two signs ruled directly by Venus.
By Planetary Position
Recommended for individuals with a weak or afflicted Venus, or those running a Shukra Mahadasha or Antardasha, provided Venus is not a functional malefic for their ascendant.
Wear as Your Birthstone
Opal is the internationally recognised modern birthstone for October, and is widely worn simply as a personal birthstone for its striking play-of-colour, in addition to its role as a gemstone of Venus.
Important: Opal and Diamond both represent Venus in Vedic astrology — for astrological use, consult a qualified astrologer with your birth chart before wearing either as a remedy.
Get expert guidance — online or in person — from our Astro Gem Experts at Only Natural Gemstones to choose the right gemstone for your horoscope.
Opal Quality
Play-of-Colour
The most important quality factor — a broad, vivid flash spanning multiple colours across a large area of the stone is more valuable than a faint, pinpoint ('pinfire') flash.
Body Tone
Black and dark-toned Opal, which makes the play-of-colour appear especially vivid, is the rarest and most valuable; white and light-toned Opal is more common and accessible.
Stability
Choose a stone free of visible surface cracks or 'crazing' (fine fractures caused by water loss), and avoid cloudy, dull-looking stones for the best results — Australian Opal is generally considered more stable than hydrophane Ethiopian Opal.
Cut
Always cut as a smooth, well-proportioned domed cabochon — never faceted — since an evenly rounded surface brings out the play-of-colour more vividly and gives the stone a noticeably better overall appearance.
Carat / Ratti Weight
Vedic astrology typically recommends Opal in Ratti (1 Ratti = 0.91 carat), commonly 5 to 9 Ratti (approx. 4.5–8.2 carats), depending on horoscope and body weight.
Price of Opal in India
Opal price depends primarily on origin, play-of-colour intensity, body tone and stability. Natural Opal in India typically starts from ₹500 per carat for commercial Ethiopian quality, and can exceed ₹15,000 to ₹30,000+ per carat for exceptional Australian stones with vivid, multi-coloured fire.
| Quality Grade | Indicative Price (per carat) |
|---|---|
| Entry / Commercial (Ethiopian, modest play-of-colour) | ₹500 – ₹2,000 |
| Good (Ethiopian/Australian, decent play-of-colour) | ₹2,000 – ₹6,000 |
| Fine Australian (strong, stable fire) | ₹6,000 – ₹15,000 |
| Exceptional / Rare (vivid multi-colour fire, large size) | ₹15,000 – ₹30,000+ |
Note: Doublets, triplets and glass 'opalite' imitations are sometimes sold at similarly low prices elsewhere but carry no recognised astrological value. Every Opal at Only Natural Gemstones is solid, natural and certified — figures above are indicative market ranges, with exact pricing listed against each stone in our collection.
Buying Guide — Authenticity & Certification
What to Watch For
Opal doublets and triplets — thin slices of natural opal glued to a dark backing, sometimes with a protective cap — are commonly sold as if they were solid stones. Smoke or sugar treatment, used to artificially darken pale opal to imitate rare black opal, is another common practice. Only Natural Gemstones does not sell doublets, triplets, or smoke/sugar-treated Opal — every stone is a solid, natural, untreated piece, with lab certification to prove it.
Common Substitutes
Opal is sometimes confused with or substituted by synthetic (lab-created) opal, which shows an unnaturally regular, honeycomb-like colour pattern, or by 'opalite', a man-made glass product with no genuine play-of-colour or astrological value.
Why Certification Matters
A gemological lab report confirms the stone is solid natural Opal — not a doublet, triplet or synthetic — and can indicate origin, which is essential given how visually convincing assembled and imitation stones can be.
Why Only Natural Gemstones
- Lifetime guarantee of authenticity on every gemstone we sell.
- Certified by the most trusted gemological laboratories, with reports you can verify online using the certificate number, before or after purchase.
- 100% natural, unheated and untreated gemstones only — never lab-grown, dyed or synthetically enhanced.
- Expert guidance from our in-house Astro Gem Experts to help you choose the right gemstone for your horoscope and budget.
- Customisation available — get your gemstone set in a ring or pendant of your choice, including a traditional open-back setting.
- Every gemstone is energised and activated through Vedic rituals before dispatch, so it is ready to deliver maximum benefit from the day it reaches you.
How to Wear Opal — Vedic Method
Metal
Silver or white metal such as white gold or platinum is recommended for Opal, in keeping with Venus's association with white, silvery tones.
Finger
Traditionally worn on the index finger of the right hand for right-handed individuals (left hand for left-handed individuals).
Setting
An open-back setting is traditionally preferred so the stone touches the skin directly for maximum astrological benefit.
Day & Time
The most auspicious day is Friday (Shukravar), ideally worn in the morning during Shukla Paksha.
Purification Ritual
Before wearing, cleanse the ring/pendant by soaking briefly in raw milk and Ganga jal, then energise it by chanting the Venus mantra — 'Om Shum Shukraya Namah' — 108 times.
Recommended Weight
Commonly 5 to 9 Ratti (approx. 4.5–8.2 carats), though exact weight should be determined by horoscope and body weight, ideally under astrological guidance.
Trial Period
A 3-day trial is often recommended before committing to wear Opal permanently.
Customisation
Get your gemstone customised into a ring or pendant of your choice at Only Natural Gemstones, complete with a traditional open-back setting for maximum skin contact.
Energisation
Every gemstone from Only Natural Gemstones is energised and activated through traditional Vedic rituals before it reaches you, so it is ready to wear and deliver benefits from day one.
Opal After Care — Cleaning & Maintenance
Cleaning
Wipe gently with a soft, slightly damp cloth; avoid soaking, and never use ultrasonic or steam cleaners, as both heat and vibration can damage Opal's delicate structure.
What to Avoid
Protect Opal from extreme dryness, which can cause its surface to crack or 'craze' over time, as well as from sudden temperature changes and prolonged water exposure, which can affect hydrophane Ethiopian Opal. Keep away from harsh chemicals, perfumes and cosmetics.
Storage
Store separately in a soft cloth pouch, away from harder gemstones that could scratch its relatively soft surface, and avoid very dry storage conditions such as a safe or airtight box for extended periods.
Re-energising
As per Vedic tradition, periodically re-energise your Opal by chanting the Venus mantra, especially after cleaning or extended periods of non-wear.
Opal - FAQs
What makes Opal's 'play-of-colour' different from other gemstone effects?
Play-of-colour is caused by light diffracting through a microscopic grid of silica spheres inside the stone, producing shifting rainbow flashes. This is distinct from the chatoyancy seen in Cat's Eye or the star effect (asterism) seen in Star Sapphire.
Is Opal a mineral like other gemstones?
Not technically. Opal is a mineraloid — hydrated amorphous silica containing water within its structure — rather than a crystalline mineral, which is why it needs distinct care compared to other Navratna gemstones.
What is 'crazing' and how do I prevent it?
Crazing refers to fine surface cracks that can develop if an Opal loses too much of its internal water content, often from extreme dryness or sudden temperature change. Avoiding very dry storage and rapid temperature shifts helps prevent it.
What is the ideal weight of Opal to wear?
Most astrologers recommend 5 to 9 Ratti (approximately 4.5 to 8.2 carats), though the exact weight should be based on your horoscope and body weight.
Which finger, metal and day should I use for Opal?
Traditionally worn on the index finger of the right hand, set in silver or white gold, on a Friday morning.
Opal or Diamond — both represent Venus, so which should I choose?
Both are valid choices for Venus remedies. Diamond is prized for its hardness and brilliance at a higher price point, while Opal offers the same planetary benefit with a distinctive play-of-colour at a considerably more accessible price.
Which month is Opal the birthstone for?
Opal is the internationally recognised modern birthstone for October, making it a popular personal choice for those born in that month, in addition to its role as a gemstone of Venus in Vedic astrology.
What is the price of natural Opal in India?
Natural, solid Opal typically ranges from ₹500 to ₹30,000+ per carat, depending on origin (Australia being the most valuable), play-of-colour intensity and stability.
Is Australian Opal better than Ethiopian Opal?
Australian Opal is generally considered more stable and durable, making it the preferred choice for long-term astrological wear. Ethiopian Opal offers vivid play-of-colour at a more accessible price but requires more careful handling due to its hydrophane nature.
Does Only Natural Gemstones provide certification with every Opal?
Yes. Every Opal sold on Only Natural Gemstones is solid, natural and comes with certification confirming authenticity — never a doublet, triplet or synthetic imitation.
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