This exceptional 1.63ct Blue Cobalt Spinel is a rare treasure sourced from Tanzania, renowned for producing some of the world’s finest cobalt-rich spinels. With its deep, vivid blue colour and striking trillion cut, this gemstone showcases extraordinary saturation and brilliance making it an ideal centrepiece for premium jewellery.

Certified by GFCO Gem Lab (Switzerland), this stone is confirmed 100% natural and unheated, preserving its true geological beauty. Cobalt spinels are highly sought after among collectors due to their rarity, durability, and intense blue hues that rival even high-end sapphires.

A gemstone of this calibre is not only stunning but also a strong investment piece in today’s coloured-stone market.

Weight: 1.63 carats

Colour (Daylight): Blue

Shape & Cut: Trillion
Dimensions: 8.18 × 8.41 × 3.40 mm
Treatment: No Heat – No Treatment
Origin: Tanzania
Certification: GFCO Gem Lab (Switzerland)

Why This Gemstone Is Special

• Rare cobalt-bearing spinel with exceptional blue saturation
• Unheated and untreated – completely natural
• Premium trillion cut with brilliant crown and step-cut pavilion
• Certified by a respected Swiss gemmological laboratory
• Ideal for high-end rings, pendants, or investment collections