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Natural Blue Topaz Stone – 6.70 Carat (7.36 Ratti) - View #1

Natural Blue Topaz Stone – 6.70 Carat (7.36 Ratti)

SKU: CGS11240480699

₹4,500
Certified Natural Blue Topaz Stone weighing 6.70 Carat (7.36 Ratti) in an exquisite oval mixed cut. 100% natural Earth-mined topaz displaying luminous sky-blue transparency and vitreous luster. Accompanied by an independent accredited gemological laboratory certificate.
Laboratory Certificate✓ Free lab report included
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Gemstone & Physical Specifications

Verified gemological characteristics and certified measurements.

Weight
6.70 Carat (≈ 7.36 Ratti)
Shape / Cut
Oval Mixed Cut
Color
Sky Blue
Species / Mineral
Natural Topaz
Refractive Index (R.I.)
1.610 - 1.620
Fluorescence
Inert
Certification Lab
ISO Certified Laboratory
Dimensions
15.00 x 10.00 x 6.00 mm
Treatment
Irradiation & Heat Treated
Transparency / Clarity
Transparent
Hardness
8.0
Specific Gravity (S.G.)
3.53 - 3.56
Conclusion / Identification
Natural Blue Topaz

Detailed Product Description

Natural Blue Topaz Stone – 6.70 Carat (7.36 Ratti)

This Natural Blue Topaz weighs exactly 6.70 Carats (7.36 Ratti). Precision-faceted into a brilliant Oval Mixed Cut with dimensions of calibrated proportion, this Earth-mined gemstone displays a vibrant sky-blue hue, crisp facet reflections, and exceptional optical clarity.

Mineralogical Identity & Physical Constants: Blue Topaz is an aluminum fluorosilicate mineral with the chemical formula Al2SiO4(F,OH)2, crystallizing in the orthorhombic crystal system. Under gemological testing, it displays a refractive index of 1.610 to 1.638 with biaxial positive character, a specific gravity of 3.53 to 3.56, and a hard 8.0 rating on the Mohs scale. In alignment with global gemological standards, intense sky-blue topaz originates as Earth-mined natural topaz and undergoes standard, permanent irradiation and annealing to stabilize its vibrant color throughout the crystal lattice.

Cultural & Modern Jewelry Context: Celebrated globally as an official modern birthstone for December (alongside Tanzanite and Turquoise) and the traditional commemorative gemstone for 4th and 19th wedding anniversaries, Blue Topaz is popular in fine jewelry. In contemporary gemstone discussions, it is appreciated for its cool icy luster in Sterling Silver (925 Silver), White Gold, or Platinum rings, pendants, and earrings.

Please Note: Ratna Gems shares these historical, cultural, and gemological details solely for educational awareness. We sell all gemstones strictly on the basis of verified physical authenticity, mineral quality, and accredited laboratory certification, and make no astrological, metaphysical, or curative claims.

Frequently Asked Questions

Is this Blue Topaz gemstone Earth-mined and natural?
Yes. This gemstone is guaranteed 100% Earth-mined natural Topaz (Aluminum Fluorosilicate, Al2SiO4(F,OH)2). In accordance with international gemological standards, it has undergone standard controlled irradiation and thermal annealing to achieve its brilliant, permanent sky-blue color.
Is the blue color of this Topaz permanent and safe to wear?
Yes. The color enhancement of Blue Topaz is completely homogeneous and permanent throughout the crystal lattice, meaning it will not fade with exposure to everyday sunlight or water. Furthermore, all gem-trade Blue Topaz complies with strict international radiation safety standards and is certified 100% safe to handle and wear.
How does Carat weight compare to traditional Ratti for this stone?
This gemstone weighs 6.70 Carats, corresponding to 7.36 traditional Sunari Ratti (1 Carat = 200 mg; 1 Sunari Ratti ≈ 0.91 Carats). Both measurements are explicitly documented on your official laboratory test report.
How is the authenticity and certification of this Blue Topaz gemstone verified?
Every Blue Topaz gemstone includes an independent accredited gemological laboratory testing report confirming natural topaz identity, cut dimensions, refractive index (1.610–1.638), specific gravity (~3.53), and disclosing standard color treatment. If you specifically require an additional report from GII, IGI-GTL (IIGJ), or GIA, you can select it directly from the certification dropdown on this product page upon request (official laboratory testing fees apply in advance on a non-refundable basis).
How durable is Natural Blue Topaz, and how should it be cleaned and maintained?
With a Mohs hardness of 8.0, Blue Topaz is very hard and highly resistant to surface scratches. However, because Topaz has perfect basal cleavage, avoid hard direct impacts against hard surfaces. Clean gently with lukewarm water, mild soap, and a soft brush. Never use ultrasonic or steam cleaners.

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Customer Reviews

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