New atmospheric data indicates that carbon is abundant in its crystal form. Lightning storms turn methane into the soot (carbon) which as it falls, hardens into chunks of graphite and then diamond. As the clouds of soot fall toward the planet, they clump together to form graphite. As the pressure increases closer to the planet's core, the graphite is compressed into a pure diamond.
These diamond "hailstones" will eventually melt into a liquid sea in the planets hot cores. The largest diamonds would more than likely be about a centimeter in diameter (big enough to put on a ring). When the diamond melts, it forms liquid diamond raindrops.
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