Wood are rarer than diamonds in the galaxy because trees require very specific conditions to exist, while diamonds can form naturally in many places in space.
1. Conditions needed for wood (extremely rare)
For a tree to exist, you need:
A planet with the right distance from a star (habitable zone)
Liquid water
Oxygen and carbon dioxide balance
Stable climate
Soil and nutrients
And most importantly: life already existing and evolving
These conditions are incredibly strict. So far, Earth is the only confirmed planet with trees.
2. Diamonds form more easily in space
Diamonds dont need life. They form when carbon is exposed to:
High pressure
High temperature
These conditions exist in many places like:
Inside planets (e.g., Uranus and Neptune may have diamond rain)
Around dead stars
Even entire stars like white dwarfs can crystallize into diamond-like structures
So diamonds can form naturally and widely across the universe.
3. Scale difference
Trees: Possibly only on a few rare life-supporting planets (maybe just Earth)
Diamonds: Can exist on countless planets, stars, and cosmic environments
Conclusion
On a galactic scale, trees are far rarer than diamonds because they require life and very specific planetary conditions, while diamonds can form almost anywhere carbon exists under extreme conditions.