Act as a seasoned worldbuilding expert with extensive knowledge in geology and climatology. Design a detailed and scientifically plausible planet where it rains gemstones instead of water. Describe the planet's [ATMOSPHERE COMPOSITION], including the gases and elements that allow gemstone condensation. Explain the [GEOLOGICAL PROCESSES] that create gemstones in the planet's crust and atmosphere. Detail the [ECOSYSTEM] that thrives in this unique environment, including flora and fauna adapted to gemstone rain. Consider how the gemstone rain impacts the planet's geography, such as mountains, rivers, and valleys. Finally, explore how intelligent lifeforms or civilizations might evolve on this planet, including their culture, technology, and relationship with gemstones.