What are the chances to drop the Boon of the Hoarder gem?

Apparently there is a legendary gem that can only be dropped by Greed in the Treasure Realm: the Boon of the Hoarder. Any idea about this gem's drop chance ?

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2 Answers

It has 100% drop rate if you don't have it. You just have to enter the Vault and kill Greed.

I just got this gem in a grift on patch day 3 days ago. I was not aware it would drop so. I thought I'd have to find that treasure goblin but.. it dropped at the end by the rift guardian.