Manik Stone 12.47 Ratti - 11.35 Carat Ruby Stone - Bangkok

Bangkok Ruby Stone (Manik) – 11.35 Carat (12.47 Ratti) Oval Mix Cut

This Bangkok Ruby Stone (Manik) weighs exactly 11.35 Carats (12.47 Ratti) with calibrated dimensions of 13 x 11 x 7 mm. Expertly faceted into a balanced Oval Mix Cut, this gemstone displays a deep, commanding red hue, vitreous corundum luster, and balanced proportions ideal for fine jewelry mounting. It has been heated and glass-filled; the treatment and the care it needs are explained below.

Mineralogical Identity & Physical Constants: Ruby is the precious red variety of corundum (aluminum oxide, Al₂O₃), colored by trace chromium (Cr³⁺) substituting for aluminum in the crystal lattice. Corundum ranks 9 on the Mohs scale (second only to diamond), but the glass that fills this stone's fissures is much softer, so it needs gentle care. Corundum has 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.

Bangkok & Treatment: In the Indian gem trade, Bangkok is the name for corundum of this kind, after the Thai gem-trading center where much of the world's corundum is treated and traded; it describes how the stone was processed, not where it was mined. This ruby has been heated and glass-filled: heating improves the color, and glass fills fine fissures that reach the surface so that they show less. This is why a Bangkok Ruby shows a rich color at a fraction of the price of an untreated stone.

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 independent laboratory certification, and make no astrological, metaphysical, or curative claims.

Care Instructions

• Wipe gently with a soft, damp cloth, then dry it with a lint-free microfiber cloth.
• Store it separately from diamonds and other gemstones, and take it off before sport, heavy work or household cleaning.
• Special Care Note for Glass-Filled Stone: Strictly avoid ultrasonic cleaners, steam machines, household acids (including lemon juice and vinegar), bleaches and detergents. Before any setting, resizing or repair, tell your jeweler it is glass-filled and keep it away from the torch, as heat and chemicals can damage the filler.

Frequently Asked Questions