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When you're out of green gems and you're in Kakusei-mode, the bulet will change color to a more darker pink and they will go faster. The circle around your character, that first was needed to display the number of green gems left will be smaller, and starting from empty it'll fill up, but only when you're not shooting. When the ring is full, the ring will dissappear and bigger ring will appear, also empty and the same thing happens again.
A total of three rings can be maxed and each time a ring is maxed, not only bullets go faster, but the power of character will increase and the type of shot will look different. Other effects are unknown.
In speed mode the gold gems are distributed differently, but look above in the section "Gold Gems" to see the difference.