DSAE test file

off-colour, adjective and noun

obsolescent, Diamond-mining
A. adjective Of a diamond: neither pure white nor of a definite colour, and so of inferior value.
1860 A. De Barrera Gems & Jewels 164If the manufactured diamond is found to contain a flaw, or what is technically termed ‘off-color’, its value is proportionately diminished.
1968 J.T. McNish Rd to El Dorado 144Many South African diamonds..are off-colour and instead of being pure coloured are tinged throughout in colours varying from pale straw and light sherry to those as dark as very old acorns.
B. noun rare. An off-colour diamond.
1873 F. Boyle To Cape for Diamonds 356The true ‘off-colour’ has no distinct tinge at all.
Of a diamond: neither pure white nor of a definite colour, and so of inferior value.
An off-colour diamond.
Derivatives:
Hence off-coloured participial adjective.
1872 C.A. Payton Diamond Diggings 118Often higher prices have been paid on the Fields, for large off-coloured (i.e. yellowish) stones.
1885 H. Rider Haggard King Solomon’s Mines 279Some of these biggest ones,..we could see by holding them up to the light, were a little yellow, ‘off coloured,’ as they call it at Kimberley.

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