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Cobalt Spinel

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description Cobalt Spinel Overview

Cobalt spinel is a rare blue variety of the mineral spinel, colored by trace amounts of cobalt. Unlike typical grayish-blue spinels colored by iron, cobalt spinel exhibits a vivid, pure blue hue. Significant deposits are found in Vietnam and Tanzania. It is frequently used in fine jewelry and is favored by gem collectors for its durability and brilliance.

help Cobalt Spinel FAQ

What gives cobalt spinel its blue color?

The vivid, highly sought-after blue color of cobalt spinel is directly caused by trace amounts of the chemical element cobalt within the stone. This distinct cobalt coloring gives it a saturation that rivals fine blue sapphires.

Where are cobalt spinels mined?

High-quality cobalt spinels are incredibly rare and are primarily found in Luc Yen, Vietnam, and parts of Sri Lanka. The Vietnamese deposits are particularly famous for producing stones with the purest, most electric blue hues.

Is cobalt spinel more expensive than sapphire?

While fine blue sapphires can fetch millions, top-tier cobalt spinels are also exceptionally expensive due to their intense rarity. However, they generally offer a more accessible price point per carat than a Kashmir or Ceylon sapphire of similar size.

How does cobalt spinel compare to blue sapphire?

Cobalt spinel is highly prized because it often exhibits a brighter, more electric blue hue without the grayish undertones sometimes seen in sapphires. Furthermore, spinel has a slightly lower refractive index but is highly brilliant and less likely to be treated or heat-enhanced.

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