Most gems can be upgraded as high as Greater Rift completion allows, but a few have a limit, after which Urshi will stop offering the chance to upgrade that gem.

They can all be upgraded by speaking with Urshi after completing Greater Rifts. Gems always drop at Rank 0, regardless of Greater Rift level, except for the Whisper of Atonement. Gems socketed into equipment in these locations do count those carried by other characters do not, nor do Gems on the ground. If each possible Legendary Gem is already in one of these locations, the Guardian does not drop a Legendary Gem at all. A Greater Rift Guardian will always drop one of the possible Legendary Gems a character does not have in their stash, inventory, or equipped items, chosen randomly. Legendary Gems only drop from Rift Guardians in Greater Rifts, except for three with unique drop mechanics. All but three of them (see below) can only be socketed into Amulets and Rings, so typically only three Legendary Gems can be used at a time, and it is always preferable to use jewelry with sockets to benefit from as many as possible.

They are also unique-equipped - two of the same Gem cannot be equipped at the same time. Like all gems, Legendary Gems are account bound. One is active as soon as the gem is socketed into an equipped item, and can be strengthened by upgrading the gem to higher ranks the second is a fixed bonus that is unlocked when the gem is upgraded to Rank 25. Legendary Gems were introduced in patch 2.1 of Diablo III. Each usable Legendary Gem has two unique powers. Legendary Gems have some stats that are the same between the different gem types, only depending on the star rating of the gem.

Fervent Fang ( Battle Pass reward only).

First Kill of the Day - 1 bound 1-star per week.

Craft from Fading Ember at the Apprentice Jeweler (random but tradeable).

Craft from AST runes at the Apprentice Jeweler (bound, choose any 1- or 2-star gem).

Elder Rift - depending on the Crests used.

Legendary Gems can be upgraded at the Apprentice Jeweler. The star rating determines the gem's Resonance and upgrade cost. The 5-star ones also have an actual rating of 2/5, 3/5, 4/5 or 5/5 on each individual gem, with 5/5 being the rarest. Each type has a star rating that can be 1, 2 or 5 stars. Legendary Gems feature in Diablo Immortal. Legendary Gems are gems featured in Diablo Immortal and Diablo III. A sketch of a Legendary Gem by Deckard Cain

Diablo 3 rare gems