Pre next gem max; 5 bronzes, 4 greens, 3 blues, 2 silvers. 40, 120, 450, 1200 total. Each has a value of 10, 30, 150, 600. At 1800, gold is born.
My theory is that gold will retain the additive amount of 2 and transform right before its third, at 5400 rep. But nobody knows, since no one has reached 3600 (2 golds) yet.