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The Gemstone was created by starting with an oversize Cylinder which was renamed Gem. Each facet or Face was created using Boolean Difference between the Gem and a Plane. This was done 91 times for this gemstone design. All input values were double precision.

Instead of 91 Faces the gemstone has 94. These extra Faces seem to always be on an edge. The pavilion should have 42 faces but I count 44 as shown in the pavilion view.

In addition to extra Faces there are sometimes extra Edges which can be removed by Dissolving.

When the gemstone is rendered in an animation Black areas appear then disappear and reappear in another area. Sometimes the rendering will have extra Faces sticking out of the gemstone.

How do I delete these extra Faces? Pavilion View

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    $\begingroup$ Have you tried removing doubles? $\endgroup$ – cegaton Sep 4 '17 at 19:47
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You have extra faces here:

enter image description here

In edit mode use Mesh>Vertices "Remove Doubles" (or choose "remove doubles" from the toolbox>Remove:>Remove Doubles.

enter image description here

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