5.87 ct Blue (Indigo) Sapphire – Oval Cut – Untreated – Basalt Related

This 5.87 ct natural sapphire exhibits a deep, velvety indigo-blue hue with rich saturation and a refined oval cut that highlights its inner glow and balanced proportions. Certified by Lotus Gemology as untreated, this stone retains its completely natural state—making it significantly rarer than heat-enhanced sapphires commonly found on the market.

Its medium-deep tone, transparent clarity, and well-executed crown and pavilion faceting give the sapphire an elegant face-up presence with smooth light return. The color type “Indigo Blue” is a coveted classification, known for its sophisticated dusk-like blue that appeals to collectors and designers seeking depth and refinement.

Every gemstone offered by Sora Gems is professionally inspected inside Bangkok’s Jewelry Trade Center (JTC) to verify authenticity, treatment status, and quality.

 

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Perfect for:

• Custom engagement rings
• High-end bespoke jewelry
• Collectors seeking rare, fully untreated sapphires
• Investment-focused purchases

 

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Specifications

 

Weight: 5.87 carats

Shape: Oval Cut

Treatment: Untreated (No Indications of Heating)

Origin: Basalt Related (commonly associated with regions such as Madagascar, Australia, Laos, Nigeria, etc.)

Color: Indigo Blue—rich, medium-deep tone with strong saturation

Clarity: Transparent

Certification: Lotus Gemology Report No. 5349-7669

Sourcing: Vetted at the JTC, Bangkok

Shipping: Secure worldwide delivery

To preserve the beauty and longevity of your gemstone, we recommend gentle care. Clean the stone using warm soapy water and a soft brush, avoiding harsh chemicals or ultrasonic cleaners unless the gem type is known to be safe for those methods. Store your jewelry separately in a soft pouch or box to prevent scratches from harder materials. Always remove gemstone jewelry during vigorous activities—such as exercising, swimming, or using household cleaners—to protect it from impact, heat, and chemical exposure. Regular professional inspections are encouraged to ensure settings remain secure and the stone stays in optimal condition.