Essendo la modalità hardcore distinta da quella normale, sarà necessario ottenere in modo distinto dalla modalità normale la gemma da Brama prima di poterla ottenere dai Guardiani.
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Once you've obtained the Boon of the Hoarder for the first time by killing Greed, you can then obtain additional copies by killing Greater Rift Guardians. As with other Legendary Gems, it will only drop from Greater Rift Guardians if you don't already have it equipped on your current character or stored in your stash.
Because your Hardcore and normal progress are independent of one another, finding this gem with your Hardcore character will only enable it to drop from Greater Rift Guardians in Hardcore mode. You'll have to find Greed with a normal game mode character for it to drop from Greater Rift Guardians in that game mode.
Hope that helps!