Most of the features we have looked at so far have been due to natural causes - even diamonds that have been cleaved during setting present a natural face. The stones depicted in this article, however, have all suffered surface damage after polishing. Diamond is often quoted as the hardest natural substance (sometimes, wrongly, as the hardest of substances). However, even diamond can be worn away whilst being used as jewellery, although it is very commonplace to examine a piece of jewellery that may be 100 years old or more and not find any trace of wear on the diamonds present.
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