Which gemstone is more powerful and costlier ruby or emrald???

Emeralds are more powerful, especially the Chaos Emeralds. They can turn thoughts into power, warp time and space, and give energy to all living things. However, it'll be near impossible to get even one because there are only seven of them in the world, and a hedgehog with super speed whose into jewelry (he needs rings to survive) and an evil robot engineer doctor who harvests animals are always battling each other to get them.