Natural Australian White Opal Stone (Doodhiya Patthar) 7.25 Carat (7.97 Ratti) 18.30x11.40 mm Oval Mixed Shape
SKU: TSGTL2890
Gemstone & Physical Specifications
Details of this stone, with the standard gemological properties of its species.
- Weight
- 7.25 Carat (≈ 7.97 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
- 18.30 x 11.40 x 5.00 mm
- Origin
- Australian
- Refractive Index (R.I.)
- 1.37 - 1.47
- Conclusion / Identification
- Natural Opal
- Certificate / Report No.
- TSGTL2890
Detailed Product Description
This Natural Australian White Opal Stone (Doodhiya Patthar) weighs 7.25 carat (7.97 ratti) and measures 18.30 x 11.40 x 5.00 mm, a high-domed oval cabochon. It shows a white body with scattered pinpoint flashes in many colours across the face. 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 scattered pinpoint flashes in many colours across the face. The colour moves and changes as the stone is tilted, so the video is the best guide to how it looks in hand. The close-up photos also show a network of fine lines on the back and near one end; look at them before you buy.
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. Because this stone already shows fine lines, a bezel-set pendant or earrings will keep it safer than a ring worn every day.
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 7.25 ct, the size as 18.30 x 11.40 x 5.00 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.
Does this opal show any lines or marks?
Yes: a network of fine lines on the back and near one end. They are visible in the close-up photos and the video, so please look at them before you buy. If you would rather have an opal without them, compare the other stones in the Opal Stones collection.
Is Doodhiya Patthar the same as opal?
Yes. Doodhiya Patthar and Opal Ratna are Indian names for opal, not a separate stone.
Can this opal be set in jewellery?
Yes. At 18.30 x 11.40 x 5.00 mm it suits a pendant or earrings in a bezel setting, which protects the stone 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
Natural Australian White Opal Stone (Doodhiya Patthar) 7.75 Carat (8.52 Ratti) Oval Mixed Shape
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.