Natural Australian White Opal Stone (Doodhiya Patthar) 7.75 Carat (8.52 Ratti) Oval Mixed Shape
SKU: TSGTL2887
Gemstone & Physical Specifications
Details of this stone, with the standard gemological properties of its species.
- Weight
- 7.75 Carat (≈ 8.52 Ratti)
- Shape / Cut
- Oval Mixed Shape
- Hardness
- 5.5 - 6.5
- Specific Gravity (S.G.)
- 1.98 - 2.25
- Certification Lab
- The Standard Gem Testing Laboratory (An ISO 9001-2015 Certified Laboratory)
- Dimensions
- 16.40 x 12.50 x 5.70 mm
- Origin
- Australian
- Refractive Index (R.I.)
- 1.37 - 1.47
- Conclusion / Identification
- Natural Opal
- Certificate / Report No.
- TSGTL2887
Detailed Product Description
This Natural Australian White Opal Stone (Doodhiya Patthar) weighs 7.75 carat (8.52 ratti) and measures 16.40 x 12.50 x 5.70 mm, a high-domed oval cabochon. It shows a white body with green pinpoint flashes and softer red flashes, gathered toward one side of the dome. It comes with a lab report from The Standard Gem Testing Laboratory, an ISO 9001-2015 certified laboratory, which identifies it as natural opal.
Opal, known in India as Doodhiya Patthar or Opal Ratna, is hydrated silica, a mineraloid rather than a crystalline mineral. Its play-of-colour comes from light diffracted by tiny, orderly silica spheres inside the stone, so no two opals show the same pattern. Australian origin, declared by Ratna Gems: Australian opal refers to opal from an Australian source; each stone's value depends on its own play-of-colour, body tone, cut, weight and treatment.
Appearance
The studio photos and the video show a white body with green pinpoint flashes and softer red flashes, gathered toward one side of the dome. The colour moves and changes as the stone is tilted, so the video is the best guide to how it looks in hand.
Traditional Use
In traditional Indian Vedic astrology, opal (Doodhiya Patthar / Opal Ratna) is traditionally associated with Venus (Shukra) and is regarded as one of the traditional upratnas, or substitute gemstones, for Diamond (Heera). Customers buying opal for astrological wear usually follow the guidance of their own astrologer.
Care
Opal is softer than most gemstones (about 5.5 to 6.5 on the Mohs scale) and holds water. Clean it with lukewarm water, mild soap and a soft cloth, then dry it gently. Avoid ultrasonic and steam cleaners, boiling water, acids, perfume, strong detergents and hard knocks, and keep it out of hot cars and sunny windows: intense light, strong heat or very dry storage can cause crazing, a network of fine surface cracks.
Compare more stones in our Opal Stones collection, or read the Opal (Doodhiya Patthar) buying guide.
Frequently Asked Questions
Is this Australian Opal natural?
Yes. Its lab report from The Standard Gem Testing Laboratory gives the conclusion Natural Opal, and the weight, size and cut on this page come from the same report.
What does the lab report say about this opal?
The report records the weight as 7.75 ct, the size as 16.40 x 12.50 x 5.70 mm, the cut as oval mixed shape, a refractive index of 1.37 - 1.47, a specific gravity of 1.98 - 2.25 and a hardness of 5.5 - 6.5. Its conclusion is Natural Opal.
Is Doodhiya Patthar the same as opal?
Yes. Doodhiya Patthar and Opal Ratna are Indian names for opal, not a separate stone.
How is Australian opal different from Ethiopian opal?
Mainly by source. Many Ethiopian opals are hydrophane and can absorb water for a while, which Australian opal usually does not. Neither is better: choose by the play-of-colour, body tone, size and price of the stone itself.
Can this opal be set in jewellery?
Yes. At 16.40 x 12.50 x 5.70 mm it suits a pendant, ring or earrings; a bezel setting protects opal best. Give your jeweller the exact dimensions before setting.
More from Opal Stones
Australian White Opal (Doodhiya Patthar) 9.46 Carat (10.39 Ratti) — Rainbow Fire / Play-of-Colour
Australian Milky Opal (Doodhiya Patthar) 3.49 Carat (3.84 Ratti) — Solid White
Natural Australian White Opal Stone (Doodhiya Patthar) 6.24 Carat (6.86 Ratti) Oval Mixed Shape
Ethiopian Welo Opal (Doodhiya Patthar) 10.02 Carat (11 Ratti) — Strong Fire / Play-of-Colour
Customer Reviews
Verified feedback across our certified Opal Stones collection. Because each natural gemstone is rare and one-of-a-kind, reviews reflect genuine patron experiences with this gemstone family.