The logo and identification number are viewable through magnification with a jeweler's loupe, and are not readily visible to the naked eye so that it doesn't interfere with the design.
James Allen: See a real photo and use a virtual loupe to examine the stones before you make your purchase by taking advantage of their unique Diamond Viewer feature.
Authentic Royal Asscher rings have the company logo and a unique identification number lasered into the stone's girdle that is best viewed with a jeweler's loupe.
Naturals are impossible to see with the naked eye and very difficult to spot, even with a loupe.
Viewed under a jeweler's loupe, a real pearl will be smooth all over.