How many rubies for an Ivandyr's Hoop?

[Ele]

To address the original point:

If Rubies are ~125p each, and the average price of the hoop is ~2500p, you'll break even at 20 turn-ins. If you sell the axe/mallets, you'll make out even better. But you'll have to deal with tracking down the turn-in troll when she is up and dealing with selling the lore axe/mallet.