From the experts:
Diamond sparkled all through the nineties--reaching as high as Number 150 in 1999. Although its shine has diminished quite a bit, it remains in use.
Followers of the British royal family may know that the name was given in honor of Queen Victoria's sixtieth anniversary on the throne - her Diamond Jubilee. It's said that the queen asked that her granddaughter, born in 1897 during the jubilee year, be named Diamond. But Victoria's son, the future George V, chose Victoria Alexandra Alice Mary instead.