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A term used to describe cloudy Diamonds that are full of inclusions - normally visible to the naked eye. Pique Diamonds (sometimes abbreviated to PK) are often used by jewellers as accent stones.
The CIBJO (Confédération Internationale de la Bijouterie, Joaillerie et Orfèvrerie) - or in English often referred to as the World Jewellery Confederation - actually use PK1, PK2 and PK3 to replace the GIA ratings of I1, I2 and I3. However, many people see them as a lower rating and a continuation of the GIA scale.
The pique measurement actually predates the GIA and can be found in many old writings. PK1 is said to clearly show inclusion under 10x magnification (a standard gem loupe). PK2 is used to describe Diamonds with inclusions visible to the naked eye, and a Diamond described as PK3 has many large inclusions that noticeably diminish the gem’s brilliance.
GIA qualified Gemmologists
Members of the British Jewellery Association
Members of the Coloured Gemstone Assocation