Where to get gem robes

Where can i start to farm gem robes
There are 2 inthe AH right now for sale

What exactly are you talking about?

Imbued gem robe of ...?

Open Elite Planar Tombs Chests to get Dark crystals, then you need the recipe to make them into a imbued piece of gear. Around 2x Crystallized Planar Ore + Planarite Ingot + Dark crystal piece

All of these items are found at the planar tombs vendor, except the dark crystals since they drop from the chest.

I thought gem robes were a thing for PL only...