Introducing an Exquisite 11.36-Carat Natural Blue Sapphire (GRS Certified)

Presenting a truly magnificent 11.36-carat natural blue sapphire, certified by GRS – Gemresearch Swisslab, one of the world’s most respected gemstone laboratories and fully recognized under Gem Rock Auctions’ certification standards.

This exceptional sapphire, with impressive dimensions of 14.49 × 12.33 × 7.82 mm, showcases a rich and vibrant blue color, offering remarkable depth, saturation, and brilliance. Its expertly crafted oval modified brilliant/step cut enhances the gem’s natural radiance while maximizing light performance and face-up appeal.

This sapphire stands out as a premium collector’s gemstone due to its rarity and purity — the GRS report confirms “No indication of thermal treatment.” Untreated blue sapphires of this size and clarity are exceptionally scarce in the global market.

Originating from Sri Lanka, one of the world’s most prestigious sources for fine sapphires, this stone embodies the island’s signature beauty, elegance, and gemological heritage.

Key Specifications:

• Weight: 11.36 carats

• Dimensions: 14.49 × 12.33 × 7.82 mm

• Shape: Oval

• Cut: Modified brilliant/step (4)

• Color: Blue

• Treatment: No indication of thermal treatment (GRS)

• Refractive Index: Standard for corundum

• Specific Gravity: Standard for corundum

• Hardness: 9 (Mohs scale)

Certification Details:

• Lab: GRS – Gemresearch Swisslab

• Report Number: GRS2025-057174

• Report Date: 8 May 2025

• Origin: Sri Lanka

• Gemologist: GRS Authorized Analyst

• Verification QR Code: Present on certificate

Description:

This breathtaking natural blue sapphire is a remarkable investment-grade gemstone—perfect for collectors, high-end jewelry designers, and connoisseurs seeking a rare, untreated Sri Lankan sapphire of significant size and beauty. Its impressive presence, combined with world-class GRS certification, makes it an extraordinary centerpiece for any luxury jewelry creation.