Rings of Saturn says, "Based on Voyager observations, the total mass of the rings was estimated to be about 3 x 10^19 kg. This is a small fraction of the total mass of Saturn (about 50 ppb) and is just a little less than the moon Mimas. read more
So Saturn's rings may be as massive as 9 x 10^19 kg. Earth 's mass is 5.97219×10^24 kg. So Earth's mass is about 100,000 times the mass of Saturn's rings. read more