Cobalt-Blue Cushion Spinel 5.2 cts – Loose Blue Gemstone

A striking cobalt-blue spinel displaying an intense medium-to-deep blue colour with flashes of cornflower blue, violet-blue and electric blue as it moves through the light.

The gemstone has an elegant elongated cushion outline with softly rounded corners and a precision-style mixed cut. Broad central facets create strong flashes of colour, while the smaller facets around the edges add lively brilliance and definition.

Its saturated blue appearance and refined proportions make this individual spinel an excellent centre stone for a bespoke engagement ring, statement ring, pendant or specialist gemstone collection.

What Makes This Blue Spinel Special?

This spinel stands out for its vivid blue colour and attractive balance between saturation and brightness. Rather than appearing flat or overly dark, the gemstone produces changing flashes of bright blue as it is tilted under the light.

Its elongated cushion shape gives it a sophisticated appearance suited to both contemporary and traditional jewellery. The stone’s rectangular proportions can visually lengthen the finger when mounted vertically, while an east–west setting would create a more modern statement design.

Ideal For

• Bespoke blue spinel engagement rings
• Statement and cocktail rings
• Custom fine-jewellery pendants
• Anniversary jewellery
• Collector gemstone portfolios
• East–west ring settings
• One-of-a-kind jewellery commissions

Frequently Asked Questions

What colour is this spinel?
It displays a vivid cobalt-blue appearance with lighter cornflower-blue flashes and subtle violet-blue undertones. Its colour changes in intensity as the gemstone moves through different angles of light.

What shape is the gemstone?
The stone has an elongated cushion shape, combining a rectangular outline with softly rounded corners.

Is this the exact gemstone I will receive?
Yes. This listing is for the individual blue spinel shown in the product photographs and video.

Can this blue spinel be used in an engagement ring?
Yes. Its elongated cushion shape and strong blue colour make it an attractive centre stone for a bespoke engagement ring. A qualified jeweller should design the setting around the gemstone’s exact measurements.

Why does the spinel look blue-violet in some parts of the video?
Blue spinel can reflect different tones depending on the light source, viewing angle, surrounding colours, camera settings and screen calibration. This gemstone may appear brighter blue in direct light and deeper blue-violet in shaded areas.

Does “cobalt-blue” confirm that the gemstone contains cobalt?
In this description, cobalt-blue refers to the gemstone’s vivid blue appearance. A definitive cobalt-bearing classification should be supported by appropriate laboratory or spectroscopic testing.

Is blue spinel suitable for fine jewellery?
Spinel is widely used in fine jewellery because it combines attractive brilliance with good everyday durability. As with any faceted gemstone, it should still be protected from hard impacts and abrasive surfaces.

Colour and Display Note

The gemstone has been filmed in natural outdoor light to show its colour, faceting and response to movement. Its appearance may vary under daylight, indoor lighting and different screen settings.

Please review the full video before purchasing, as moving footage provides the clearest representation of the gemstone’s colour range and light performance.

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