Should I sell my remaining Rift Keystone fragments?

Since the 2.3.0 patch, any rift keystones now have a message showing in the tooltip saying "This is useless. Perhaps you should sell it."

Given that they are no longer used to open the Nephalem rifts, is that indeed the case, or is there still some hidden use for them?

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What do rift Keystone fragments do?

Rift Keystone Fragments are used to open Nephalem Rifts. As of version 2.0. 6, a Nephalem Rift costs five rift keystone fragments to open. A keystone fragment is generally awarded for completing a single bounty, with bonus keystone fragments dropped in a Horadric Cache after completing all bounties in a given area.

Do greater rifts drop keystones?

A Greater Rift Keystone (GRK) is required to open a Greater Rift when applied to a Nephalem Obelisk. They drop from level 70 Rift Guardians in normal Nephalem Rifts. On higher difficulties, two or even three Keystones may drop at once. The GRK is lost when used.

How many greater rift stones can you hold?

Greater Rift Keystones can be stacked up to 100 in a single inventory slot, and can be used to access Greater Rifts in Diablo 3, which give you even better loot of course.

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