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When Argyle pink diamonds are illuminated with light having wavelengths below about 420 nm, the pink colour will be bleached to an increasing extent with lower wavelengths. At SW wavelengths the pink colour may be totally removed generally leaving the brownish component. The colour will only return with exposure to light having wavelengths longer than about 450 nm. Time itself will not restore the colour. Often diamonds that are tested either with an Inspector or during fluorescence grading need to be packaged or stored immediately after inspection, without affording the time to expose the gem to ambient white light. A Pink Restore illuminates with strong light having the optimum wavelength for restoration. Typically about 1 minute is all that is necessary to restore the colour in a pink diamond that has been totally bleached. |