Cosmogenic ³He can be produced in diamonds during their post-eruptive residence near the surface (Lal, 1987). Cosmogenic ³He production is not expected 5 meters below the surface in alluvium or weathered kimberlite or lamproite pipes (Lal et al., 1989). ¹⁰Be has a half life of 1.5X10⁶ years and can be used to date the exposure time to cosmic rays, but a saturation level can be reached limiting the time interval in which 10Be can be used. Saturation depends on the material, latitude, and altitude and is typically reached in several million years. Unlike ¹⁰Be, 3He however, will continue to accumulate in the diamond (Lal et al., 1987). ³He values for alluvial and pipe stones from separate data sources can be distinguished for almost all the examples where both diamond occurrences were analyzed. The absolute values, however, do not show consistency between the two data sets. The differences in absolute values could be due to different laboratory procedures. The data presented suggest that 3He content in diamond is a potential tool to identify and discriminate diamonds with a long, short or no exposure time to cosmic rays, mainly if combined to the calculated 10Be exposure time. The results that both isotopes (and perhaps others) can provide are directly related to the time interval that a diamond population has been involved, or not, in sedimentary recycling. Examples of diamond prospecting where this exploration tool could be tested are Guaniamo (Venezuela) and Sao Francisco Craton (Brazil).