What size are you looking at? Over 1 carat usually has an image of the pavilion that shows how many chevrons the stone has. Under 1 carat usually
does not. You would want to get the same number of pavilions. That along with table size and L*w should help a lot. Your, or Pricescoper, eye's
will have to take you the rest of the way. Its not impossible.
Edit - you will definitely need to shop somewhere that has pictures/images if that was a question.