In a half-filled rotating drum, the size segregation of equal density particles builds a ring pattern of large beads, which continuously varies from the periphery to the center, depending on the beads size ratio[Thomas, Phys. Rev. E 62 (2000) 961].These circles show that segregation at an intermediate level within a flow is possible. This comes from a balance, at that level, between two segregation effects: a mass and a geometrical effect, both due to the size difference. Because a mass difference can be due to a size difference, but also to a density difference, here, we experimentally vary the mass effect by studying the segregation of particles of different densities and sizes in a drum and other devices (chute flow, pile). The ring continuously varies from the periphery to the center and is very sensitive to the size (1 to 33) and density ratios (0.36 to 4.8). For the densest beads, the ring is close to the center, for the lightest to the periphery. The mass excess (due to a size, a density excess, or both) leads heavy beads to segregate deep inside, by a push-away process. The size excess leads large beads to segregate at the surface, by a geometrical dynamical sieving process. The ring radius is determined by relative intensities of both effects. For equal density beads, the geometrical effect is dominant for size ratios typically<5: large beads are at the surface; this effect is negligible for size ratios typically>15: large beads are close to the bottom. The ring formation corresponds to a balance between these effects, thus we can study the geometrical segregation effect, using data acquired on the locations of segregated beads of different densities and sizes.