Manik Stone 8.70 Ratti - 7.92 Carat Ruby Stone - Bangkok A1

Bangkok Ruby Stone (Manik) – 7.92 Carat (8.70 Ratti) Oval Mix Cut

This Bangkok Ruby Stone (Manik) weighs exactly 7.92 Carats (8.70 Ratti) with calibrated dimensions of 12 x 10 x 6 mm. Expertly faceted into a balanced Oval Mix Cut, this Earth-mined gemstone displays a deep, commanding red hue, vitreous corundum luster, and balanced proportions ideal for fine jewelry mounting.

Mineralogical Identity & Physical Constants: Ruby is the precious red variety of Natural Corundum (aluminum oxide, Al₂O₃), colored by trace chromium (Cr³⁺) substituting for aluminum in the crystal lattice. Ranking at Mohs hardness 9.0 (second only to diamond), it exhibits superior scratch resistance and lifelong wearability. Under gemological testing, it demonstrates a refractive index of 1.762 to 1.770 (birefringence 0.008, uniaxial negative), a specific gravity of 3.99 to 4.01, and a diagnostic trigonal crystal system.

Geographical Origin & Lapidary Profile: Cut and polished in Bangkok, Thailand—the world's foremost cutting and trading center for fine corundum—this gemstone combines symmetry with rich visual depth. This ruby has undergone heat treatment with lead-glass filling to enhance transparency and face-up brilliance. All treatments are fully disclosed upfront in accordance with global FTC and CIBJO lapidary ethics.

Cultural Legacy & Traditional Wearing: Known in Sanskrit as Manikya or Ratnaraj (“King of Gems”) and universally in India as Manik (माणिक), Ruby holds a revered position in Vedic astrology as the primary gemstone linked to the Sun (Surya / सूर्य). Traditionally, it is mounted in Yellow Gold, Panchdhatu, or Copper for rings and pendants worn on the ring finger (Anamika) of the working hand on Sunday mornings during Shukla Paksha.

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.

Care Instructions

• Clean gently with lukewarm water, a mild dish soap solution, and a soft-bristled brush, then wipe dry with a lint-free microfiber cloth.
• Thanks to its Mohs 9 hardness, ruby is exceptionally durable and scratch-resistant, but should still be stored separately from diamonds and other gemstones to prevent surface scuffs.
• Special Care Note for Glass-Filled Stone: Strictly avoid ultrasonic cleaners, steam machines, harsh household acids (including lemon juice and vinegar), bleaches, and extreme heat torches during jewelry repair, as these can degrade the filler.

Frequently Asked Questions