Blue Topaz Stone 4.48 Carat (4.92 Ratti) Oval Mixed Cut
SKU: TSGTL2322
Gemstone & Physical Specifications
Details of this stone, with the standard gemological properties of its species.
- Weight
- 4.48 Carat (≈ 4.92 Ratti)
- Shape / Cut
- Oval Mixed Cut
- Color
- Sky Blue
- Species / Mineral
- Natural Topaz
- Refractive Index (R.I.)
- 1.61 - 1.62
- Fluorescence
- Inert
- Certification Lab
- The Standard Gem Testing Laboratory
- Dimensions
- 10.30 x 9.30 x 6.25 mm
- Treatment
- Un-Heated & Un-Treated
- Transparency / Clarity
- Transparent
- Hardness
- 8.0
- Specific Gravity (S.G.)
- 3.49 - 3.57
- Conclusion / Identification
- Natural Blue Topaz
- Certificate / Report No.
- TSGTL2322
Detailed Product Description
This Blue Topaz Stone weighs 4.48 carat (4.92 ratti) and measures 10.30 x 9.30 x 6.25 mm, fashioned in an elegant oval mixed cut. It exhibits a clear, transparent sky blue tone with vitreous luster and comes with an independent gemological laboratory report from The Standard Gem Testing Laboratory identifying it as natural topaz.
Topaz is an aluminium fluorosilicate mineral known for its crisp transparency and fire. Colourless topaz is abundant in nature, and almost all blue topaz on the gem market owes its colour to irradiation followed by heating, which produces a blue colour that remains stable in normal wear; routine gemological testing cannot prove whether a blue topaz's colour is natural or the result of laboratory enhancement. Every Ratna Gems blue topaz comes with its authentic laboratory certificate card, confirming genuine natural topaz identity rather than simulant materials such as glass, synthetic spinel, or quartz.
Appearance
Its colour is Sky Blue, a delicate pastel blue shade reminiscent of a clear sky. As a faceted oval mixed cut, light enters the crown facets and reflects through the pavilion to produce bright visual brilliance. The studio photographs and 360-degree video show this gem face-up, at perspective angles, from the reverse base, and held in hand for accurate evaluation.
Traditional Use
Blue topaz sits outside the classical Navratna gemstones and their traditional upratnas. Some buyers choose it as an affordable blue gemstone in place of Blue Sapphire (Neelam); Blue Topaz and Neelam are different gemstones. Customers buying it for astrological use usually follow their astrologer's or Pandit ji's guidance. Blue topaz is also a December birthstone.
Care
Topaz rates 8.0 on the Mohs hardness scale, making it resistant to everyday surface abrasions. However, topaz features perfect basal cleavage and poor toughness, meaning sharp blows or pressure can split the stone along cleavage planes. Clean gently using warm soapy water and a soft cloth, and dry thoroughly. Protect it from sudden thermal shocks, ultrasonic cleaners, steam treatments, and prolonged exposure to strong heat. A protective bezel setting is recommended for daily rings, or a pendant setting that avoids direct impacts.
Explore our complete Blue Topaz Stones collection or consult our general gemstone buying guide for additional guidance.
Frequently Asked Questions
What does the lab report confirm about this blue topaz?
The test certificate from The Standard Gem Testing Laboratory identifies this gemstone as natural topaz with an oval mixed cut, weight of 4.48 carat (4.92 ratti), dimensions of 10.30 x 9.30 x 6.25 mm, refractive index of 1.61 - 1.62, and specific gravity of 3.49 - 3.57. The original certificate card is shown in the gallery and is delivered free with the gemstone.
What does Sky Blue mean in blue topaz?
Sky Blue is an established gemstone trade classification for a soft, light pastel blue tone. It is distinctly lighter than Swiss Blue (medium electric blue) and London Blue (deep velvety steel blue).
Is Blue Topaz the same gemstone as Blue Sapphire (Neelam)?
No. Blue topaz is an aluminium fluorosilicate (topaz), while blue sapphire is corundum (aluminium oxide). They have different mineral compositions, crystal structures, and optical properties. While some choose blue topaz as an affordable blue alternative, they are completely separate gemstones.
Can this blue topaz stone be set into jewellery?
Yes. Measuring 10.30 x 9.30 x 6.25 mm, this oval mixed cut stone is ideally proportioned for a custom ring, pendant, or brooch in silver, white gold, or yellow gold. Share these exact dimensions with your jeweller to create a tailored setting.
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Customer Reviews
Verified feedback across our certified Blue Topaz Stones collection. Because each natural gemstone is rare and one-of-a-kind, reviews reflect genuine patron experiences with this gemstone family.