Blue Nile Glossary
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  Girdle:

Girdle

  The intersection of the crown and pavilion which defines the perimeter of the diamond. While generally a minor consideration, Blue Nile recommends avoiding girdles graded either extremely thin, which makes diamonds more susceptible to chipping, or extremely thick, which puts too much weight in the middle of the diamond, causing it to look smaller than diamonds of similar weight.

See also: Diamond Cut, Depth, Table.


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