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Star Ruby Stone 9.07 Ratti - 8.25 Carat - View #1

Star Ruby Stone 9.07 Ratti - 8.25 Carat

SKU: GS12220446499

₹2,887
Certified Natural Star Ruby Stone (Sitara Manik) weighing 8.25 Carat (9.07 Ratti) in a high-domed oval cabochon cut. 100% natural, unheated, Earth-mined corundum displaying a captivating six-ray star effect (asterism) gliding across rich purplish-red body tones. Accompanied by an accredited laboratory certificate.
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Gemstone & Physical Specifications

Verified gemological characteristics and certified measurements.

Weight
8.25 Carat (≈ 9.07 Ratti)
Shape / Cut
Oval Cabochon
Color
Purplish Red
Species / Mineral
Natural Corundum
Refractive Index (R.I.)
1.762 - 1.770
Fluorescence
Inert to Moderate Red
Certification Lab
ISO Certified Laboratory
Dimensions
11.00 x 11.00 x 6.00 mm
Treatment
100% Natural / Un-Heated
Transparency / Clarity
Translucent to Semi-Translucent
Hardness
9.0
Specific Gravity (S.G.)
3.97 - 4.05
Conclusion / Identification
Natural Star Ruby

Detailed Product Description

Natural Star Ruby Stone (Sitara Manik) – 8.25 Carat (9.07 Ratti)

This Natural Star Ruby (known traditionally across India as Sitara Manik) weighs exactly 8.25 Carats (9.07 Ratti) with calibrated dimensions of 11 x 11 x 6 mm. Expertly shaped and polished into a high-domed Oval Cabochon, this rare Earth-mined gemstone displays a vibrant purplish-red hue and exhibits the mesmerizing optical phenomenon of asterism—a distinct, floating six-ray star gliding across the surface when illuminated by a concentrated light source.

Mineralogical Identity & The Science of Asterism: Star Ruby is a natural variety of Corundum (Al2O3) colored by trace chromium ions. Asterism occurs naturally due to dense, intersecting microscopic needles of Rutile (Titanium Dioxide, TiO2 silk) aligned crystallographically along the three basal axes of the hexagonal corundum crystal at 60-degree angles. Under gemological testing, it displays a refractive index of 1.762 to 1.770, a dense specific gravity of 3.99 to 4.01, and a formidable Mohs hardness of 9.0 (second only to diamond).

Cultural & Traditional Context: In historical Indian lore and Vedic astrology, Star Ruby is linked to the Sun (Surya) as a dynamic, asteriated form of Ruby (Manik). Customary traditions suggest mounting Star Ruby in 22K/18K Yellow Gold, Copper, or Panchdhatu for Sunday morning wear on the ring finger (Anamika) of the working hand.

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 Star Ruby gemstone 100% natural and unheated?
Yes. This gemstone is guaranteed 100% Earth-mined natural corundum. It is completely unheated and untreated, because high-temperature heat treatment dissolves the delicate rutile silk that produces the natural six-ray star phenomenon.
What causes the six-ray star effect (asterism) in Star Ruby?
Asterism is caused by dense networks of microscopic rutile (TiO2) needle inclusions oriented along the three crystallographic axes of corundum at 60-degree angles. When cut en cabochon and illuminated by a direct light source (sunlight or flashlight), light reflects off these needle networks to form a luminous six-ray star that floats across the dome.
How does Carat weight compare to traditional Ratti for this stone?
This gemstone weighs 8.25 Carats, corresponding to 9.07 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 Star Ruby verified?
Every Star Ruby gemstone includes an independent accredited gemological laboratory testing report confirming natural corundum identity, cut dimensions (11 x 11 x 6 mm), refractive index (1.76–1.77), specific gravity (~4.00), diagnostic asterism, and unheated status. 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 Star Ruby, and how should it be cleaned and maintained?
With a Mohs hardness of 9.0 and exceptional tenacity, Star Ruby is among the most durable gemstones in the world, ideal for daily ring wear. Clean with warm water, mild soap, and a soft cloth or brush. Avoid ultrasonic cleaners if internal natural fissures are present.

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Customer Reviews

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