Schijveschuurder, is not a translation from Dutch into English. Which means "schijf cleaner" or "scaife cleaner". The name schijf or scaife refers to the rotating disc with which the diamond is cut (source: Jack Santcross, pers. comm. July 16th 2012)
'Scaif is a polishing wheel infused with a mixture of olive oil and diamond dust used in the diamond cutting industry.' See https://en.wikipedia.org/wiki/Scaif
See also this site for a further explanation