Sentence:  When the cut diamond is fixed in the dop, and that is adjusted in the tongs, the stone is placed upon the <WSD>skive</WSD>, which, being set in motion, if the diamond be examined in the course of from ten to fifteen minutes time, the facet will appear to have lost a part of the gray colour it had obtained from the process of cutting, and a brilliant lustre or polish will begin to appear, which is solely produced from the imbedded powder with which the surface of the <WSD>skive</WSD> is charged. 
Meaning of the word marked with <WSD> tags:  A rotating iron disk coated with oil and diamond dust used to polish the facets of a diamond.