Planet XJ-312, also known as Diamondia, presents an astonishing atmospheric phenomenon—crystalline diamond rainfall. Viewed from space, this mid-sized celestial body exhibits a swirling bluish-gray atmosphere speckled with bright, white clouds, hinting at its rich carbon content. Diamondia's most remarkable feature is its frequent and intense storms where carbon-rich clouds, under high pressure, precipitate diamonds that shimmer as they descend through layers of dense methane and hydrogen. The surface of Diamondia is rugged, littered with heaps of uncut diamonds and graphite, surrounded by shallow basins filled with hydrocarbon sludge. These glittering diamond deposits reflect and refract the planet's weak sunlight, creating a luminescent landscape that fluctuates with the shifting light. The extreme atmospheric pressure and cold temperatures solidify gaseous methane on the surface, fashioning a sparkling, frost-like overlay that covers much of the terrain. This unique combination of high pressure, abundant carbon, and intense cold crafts a world where celestial sparkle is as common as rain on Earth.