Sapphire

Corundum

Image #:

GB10185

Origin:

Synthetic

Flame-Fusion/Verneuil

Treatment:

None/Not detected (AGTA N)

Field of view \ Magnification:

6.53 mm

Photography technique(s):

Cross polarized filters

These colorful striations visible under crossed polarized filters are called Sandmeier-Plato lines. They are internal polysynthetic crystal patterns in synthetic corundum, serving as a diagnostic feature of Verneuil (flame-fusion) growth.

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