Citrine

Sunlight decided to set, and this is what was left behind.

Tier: Rare
Base odds: 1 in 170
Sell value: 61 coins
Zone: Meadow

With a mutation

Ancient: 3,050 coins
Glitched: 915 coins
Radiant: 305 coins
Shiny: 122 coins

Your luck, pets and passes make rare gems more likely than the base odds shown.