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Star (Christchurch), Issue 8029, 6 June 1904, Page 4

•Amongst its numerous and unique accomplishments, radium possesses the power of immediately enabling one to distinguish between diamonds ahd paste. The real gem responds at once, and takes on a beautiful luminosity in the dark, whereas paste remains dull. Two observers have recently gone over 13,000 different kinds of mineral with radium, the Rontgen rays and ultra-violet light, and- it is plain that the mere amplication of only a few pounds' worth of radium in the dark constitutes the cimplest, and, in the long run, the cheapest, test for genuine diamonds yet discovered. '