9.10 ct Cobalt-Blue Spinel – Large Cushion-Cut Loose Gemstone

An impressive 9.10 carat cobalt-blue spinel displaying a luminous cornflower-blue colour with cool violet and soft periwinkle undertones. The gemstone’s broad cushion shape and lively faceting create bright flashes across the surface, giving the stone excellent visual depth and brilliance.

At over nine carats, this is a substantial loose spinel with commanding presence. Its cool blue colour and softly rounded cushion outline make it an exceptional centre stone for a bespoke statement ring, pendant or significant gemstone collection.

Why This 9.10 ct Blue Spinel Stands Out

The defining feature of this gemstone is its impressive combination of size, colour and brilliance. The cool blue body colour appears bright and open rather than overly dark, allowing the internal facets to remain clearly visible.

As the gemstone moves, it reveals flashes of icy blue, cornflower blue, lavender-blue and deeper violet-blue. These subtle shifts give the stone a dynamic appearance under daylight and changing viewing angles.

Its generous cushion proportions provide exceptional face-up presence, making it suitable for a bold one-of-a-kind jewellery design.

Ideal For

• Bespoke blue spinel rings
• Statement and cocktail rings
• Collector-grade jewellery projects
• Custom fine-jewellery pendants
• Anniversary or milestone gifts
• Important loose-gemstone collections
• One-of-a-kind jewellery commissions

Frequently Asked Questions

What colour is this 9.10 ct spinel?
It displays a luminous cornflower-blue colour with cool violet, lavender-blue and periwinkle undertones. The exact balance of colour may change under different lighting conditions.

How large is this gemstone?
The spinel weighs 9.10 carats, giving it substantial face-up presence. Its exact physical size should be confirmed using the listed millimetre measurements.

What shape is the gemstone?
It has a broad cushion shape with softly rounded corners and a faceted mixed cut.

Is this spinel suitable for a statement ring?
Yes. Its impressive carat weight, broad face-up shape and cool blue colour make it particularly suitable for a bespoke statement or cocktail ring.

Can this gemstone be used in a pendant?
Yes. A custom pendant setting could showcase its size and allow light to enter the gemstone from multiple directions.

Will I receive the exact spinel shown in the photograph?
Yes. This listing is for the individual 9.10 ct spinel displayed in the product images.

Why does the colour appear more violet in some areas?
Faceted blue spinel may reflect different blue and violet tones according to the light source, viewing angle, surrounding environment, camera processing and screen calibration.

Does “cobalt-blue” mean laboratory testing has confirmed cobalt?
In this listing, cobalt-blue describes the gemstone’s visible colour. A definitive cobalt-bearing classification should only be stated when supported by appropriate laboratory or spectroscopic testing.

Colour and Photography Note

The gemstone has been photographed in natural outdoor light to demonstrate its colour, cut and brilliance. Its appearance may vary under indoor lighting, shaded daylight and different screen settings.

Please review all available images and videos before purchasing. Moving footage is especially helpful for observing the gemstone’s colour range and light performance.

Explore more — browse more cobalt-blue spinel, read the cobalt-blue spinel guide, learn what drives spinel value, and see how every stone is natural, untreated and independently certified. For an impartial overview, see the GIA spinel buyer’s guide.