A device (1) for detecting the sparkle effect of a transparent sample (2) arranged in front of an image source (3), to which also a first polarizer (4) having an optical axis of polarization is associated, wherein the detection device (1) includes an imaging system (6), and wherein the transparent sample (2), the first polarizer (4) and the imaging system (6) are arranged along an optical path originated from the image source (3). The detection device (1) includes a second polarizer (5), arranged between the transparent sample (2) and the imaging system (6), having an optical axis of polarization directed at ninety degrees with respect to the optical axis of polarization of the first polarizer.