As rubber (Hevea brasiliensis) seeds become economically important seed size variations observed for several Hevea brasiliensis clones is being evaluated from a commercial stand point. Twelve clones were studied and both inter-clonal and intra-clonal variations were observed for (i) Seedsize grades (ii) Wholeseed and kernel weights (iii) Shelling percentage (iv) Seed oil yield; and (v) Percent defatted seed cake remains. Four seed grades were identified which showed overall intraclonal distribution of 0.4;( grade 1), 66.41;( grade 2), 17.19;(grade 3), and 12.93;(grade 4). Seedsize grade weight variations were highly significant for the twelve clones. Mean whole seed weight variation showed a range of 1.32g between clones GT 1 (3.25g) and RRIM 623 (4.57 g) while mean kernel weight variatiob ranged from 1.81g for GT 1 to 2.72g for Tjir 1 from 1,000 seeds. There was a shelling percentage range from 52.52;for RRIM 623 to 65.54;for RRIM 623. The commercial implications of these variations are discussed quantitatively.