Kyanite 4.70 Ct Natural Royal Blue Color Kyanite Gemstone

257

SKU
Dimensions (mm): 12.000 x 9.000 x 6.000mm
Weight (cts): 4.700
Treatment: No Treatment
Type: Faceted
Colours

Origin: PaKistan

Sapphire can appear similar to Kyanite, but can be distinguished by its greater hardness. Iolite is visibly pleochroic, and Tanzanite is usually lighter in color and has a more purplish hue.

The blue color of Kyanite is usually inconsistent in crystals, with lighter and darker color zones and streaks often present. This can make cutting a crystal into a gem a challenge as color consistency in a gem is more desirable. Kyanite can also form in other colors such as colorless, white, green, yellow, and orange, but these other colors are uncommon, and generally only the blue color is used as a gemstone. Kyanite gemstones rarely display asterism in cabochons.

Kyanite is the most anisotropic of all gemstones, meaning its hardness differs on its horizontal and vertical sides. It is fairly soft when cut parallel to the long axis of the crystal, with a hardness of only 4.5 to 5.5. On the shorter side of the crystal the hardness is 6 to 7. This unique hardness property plays a role when cutting a crystal. Care must also be exercised not to scratch Kyanite gems as they are fairly soft for a gemstone (specifically on their horizontal axis).

SKU
Dimensions (mm): 12.000 x 9.000 x 6.000 mm
Weight (cts): 4.700
Treatment: No Treatment
Type: Faceted
Colours

Origin: PaKistan

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