Variable speeds for buffing and polishing

Advantages of using variable speeds for buffing and polishing

Dear all,

would like to understand if any body has experienced the advantages/
disadvantages of using dual or variable speed motor for buffing and
polishing.

Presently we run them at 2800 RPM constant would an increase or
decrease in speed from this make a difference in polishing/buffing 18
K diamond set gold jewelry in all 3 colors.

Khushroo H. Kotwal