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A steel-blue Aquamarine cabochon from Padre Paraiso, Minas Gerais, Brazil.
Held within the transparent gem are a series of dark crystal platelets of Goethite arranged along growth-planes of the Aquamarine host (magnified images 4 and 5).
These reflective, metallic inclusions give rise to an unusual optical effect.
As the gem is tilted under a light source, a diffuse but visible cat's-eye hovers over the domed surface of the cabochon.
To see a short video of the effect on YouTube, please use this link:
weight: 9.87 carats
shape: Drop shape cabochon
dimensions: 20.05 x 10.63 x 7.37 mm