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The polishing of stones, whether cabochon or facetted, is accomplished by the use of very finely powdered abrasives such as corundum powder, tripoli, pumice, putty powder, etc.

Stones, such as agates, which are found on the sea beach, or any stone which is required to be polished, is to be first ground down to a rough surface, then polished by successive rubbings of first, second, and third grit-stones of different degrees of fineness, lastly "Water-Ayr" or "Snake-stone," and finished with "putty powder" applied with oil.

The process is this: Fasten the horns firmly somewhere and attack first with rasp, then file, scrape with glass, fine sandpaper, finer sandpaper, powdered pumice stone, putty powder.

Marble is ground very easily with sand and water; it is fined with emery and polished with putty powder, which, I understand, is best used with water on cloth or felt.

Some glass polishers prefer to use putty powder as a polishing material, and it is sometimes said to act more quickly than rouge; from my rather limited experience I have not found this to be the case, but it may have merits that I do not know of.