as well as EVERY SATURDAY in AUGUST
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A diamond so classified for its lack of clarity (or purity) as a result of its having very small inclusions (piqués) of carbonaceous material, usually visible to the naked eye. There are grades of piqué diamonds according to the extent of the inclusions. Often referred to as 'PK'.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson