Bronze Egg is a standard pet egg and costs 1000 Pethereum Crystals. Bronze Egg contains pets with between 1.0 - 5.0 rarity.
Silver Egg is an upgraded pet egg and costs 10000 Pethereum Crystals. Silver Egg contains pets with a minimum 2.5 rarity.
Gold Egg is the most expensive pet egg and costs 100.000 Pethereum Crystals. Gold Egg contains pets with a minimum 3.5 rarity.