Diamonds with 57/58 facets

This is yet another one diamond with 57 and 58 facets (+1 facet for culet).
It uses angles recommended for the diamonds with 57 facets, so it should look very much like the real diamond that can be found in real life cuts.

Just info I recognized working on the model is that girdle is required for real diamonds to avoid chipping when mounting into rim of ring. While ideal diamond cut don't require culet, since ideal cut has pavilion facets with joint in one point and thus have 57 facets, but if it is not the case the culet is added as 58th facet.

For several more or less proper diamonds see also:
http://www.thingiverse.com/thing:9822
http://www.thingiverse.com/thing:50915
http://www.thingiverse.com/thing:167086
http://www.thingiverse.com/thing:170354
http://www.thingiverse.com/thing:170356 (dup for previous?)
http://www.thingiverse.com/thing:375290
http://www.thingiverse.com/thing:817403
http://www.thingiverse.com/thing:1523313

The other models on this site are either not round 57/58 diamonds or they are obviously incorrectly reproduced.

03/20/2017 - Updated diamond models bazel facet precision to make surface more flat. Fixed facets orientation/normals. Added models with girdle.