fish-eye A dark gray to black (achroic) spot at the center of the gem caused by improper proportions from poor cutting; see also extinction.
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fish-eye When light travels through the girdle and reflects from a flat-angled pavilion, the image of the girdle is transmitted just inside the table.
A narrow stone can get a "Fish-Eye" circle around the Table. While a deep stone can become dark in the center and resemble a "Nail Head".
See image below.
So you can see, a Diamond Cut more Ideal, will give you the best results.
beauty and value of the stone because they have a negative influence on the "life", is considered to be decisive for the proportions grade. These optical effects include, amongst others, the black table reflection, culet visible in bezes, fish-eye, ...
 See also: Color, Facet, Surface, Gemstone, Stone
  
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