Bangkok Blue Sapphire (Neelam) 6.95 Carat (7.64 Ratti) — Oval Mix Cut

Bangkok Blue Sapphire (Neelam) – 6.95 Carat (7.64 Ratti) Oval Mix Cut

This Bangkok Blue Sapphire (Neelam) weighs exactly 6.95 Carats (7.64 Ratti) with calibrated dimensions of 11.1 x 8.8 x 3.6 mm. Expertly faceted into a balanced Oval Mix Cut, this Earth-mined gemstone displays a deep, commanding blue hue, vitreous corundum luster, and balanced proportions ideal for fine jewelry mounting.

Mineralogical Identity & Physical Constants: Blue Sapphire is the precious blue variety of Natural Corundum (aluminum oxide, Al₂O₃), colored by intervalence charge transfer between trace titanium (Ti⁴⁺) and iron (Fe²⁺) substituting within the crystal lattice. Ranking at Mohs hardness 9 (second only to diamond), it offers superior scratch resistance and lifelong wearability. Under gemological testing, it exhibits 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 sapphire 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 Neelam (नीलम) or Indraneel, Blue Sapphire holds a prominent position in Vedic astrology as the primary gemstone linked to Saturn (Shani). Traditionally, it is mounted in Sterling Silver (925 Silver), White Gold, or Panchdhatu for rings and pendants worn on the middle finger of the working hand on Saturday 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, blue sapphire is exceptionally durable and resistant to scratching, 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, bleaches, and extreme heat torches during jewelry repair, as these can degrade the filler.

Frequently Asked Questions