5.81 ct “Cobalt Blue”_Unheated Cobalt Blue Spinel

A Magnificent Natural Unheated Cobalt Blue Spinel

Behold a true masterpiece of nature: an exceptionally rare, unheated natural Cobalt Blue Spinel. Weighing an impressive 5.81 carats and measuring 9.8 x 9.5 x 7.1 mm, this gemstone features a beautifully proportioned cushion cut that perfectly maximizes its brilliant light return and internal fire. Entirely free of thermal enhancement, this pristine spinel boasts a mesmerizing, highly saturated blue hue driven by trace amounts of natural cobalt, placing it among the most coveted and elusive treasures in the gemstone world. Its remarkable clarity, substantial size, and vivid, electrifying color make it a world-class centerpiece for bespoke high jewelry or a crown jewel for a serious collector.

• Gemstone Type: Natural Spinel (Variety: Cobalt Blue)

• Weight: 5.81 carats

• Dimensions: 9.8 x 9.5 x 7.1 mm

• Enhancement: None (No Heat / Unheated)

• Cut/Shape: Classic Cushion

**Why You’ll Love It**

– **Vivid Cobalt-Blue Hue**: Deep, oceanic colour prized by collectors
– **Brilliant Cushion**: Exceptional fire, scintillation & depth
– **Unheated**: 100 % natural—no treatments or enhancements
– **Durable**: Spinel rates 8 on the Mohs scale—ideal for everyday wear

**Shipping & Returns Guarantee**

• Insured worldwide shipping: Orders are insured in transit and tracked from dispatch to delivery. Free shipping on orders totaling 1,000 USD or more.
• Inspection: 14-day inspection period with a full refund if not completely satisfied (buyer covers return postage).
• Photos & Color: All photos are taken in neutral daylight to show true color; but actual color may vary across screens.
• Certificate: Certificate of authenticity available on request. Daylight video or extra verification footage can be provided on request.
• How to get help: Questions or to start a return? Use our contact page or call during business hours.
• Optional: Exchange available (subject to availability). Refunds issued 3–5 business days after receipt and inspection.

**Custom Orders**

We’re delighted to collaborate on bespoke designs tailored to your vision. From precious metal selection to setting style and sizing, our team will guide you through every detail to create a piece that’s uniquely yours.