When hit with a laser they can fluoresce for hours afterwards, thanks to defects in the diamond that absorb the laser energy and emit light of their own at a different wavelength.

• FND用激光照射后在几个小时内可发出荧光，其原因是钻石上的瑕疵吸收了激光能量并以不同的波长发射自身的光线。