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Continue ShoppingTo complete the PoE 3.28 challenge of obtaining a level 21 or 23% quality gem in Path of Exile, you must use a Vaal Orb on a level 20, 20% quality gem. The most efficient method for a 21/20 or 20/23 gem is using a Vaal Orb; for a 21/23 gem, use the Locus of Corruption (T3 Gem Room) in Alva’s Temple.
This is the most common method but only allows for one positive outcome.
Target Gem: Use a Level 20 gem (to hit Level 21) or a 20% Quality gem (to hit 23% Quality).

To increase your chances or attempt to get both 21/23 at once, use the Lapidary Lens in the Level 3 Gemcutter's Room (Doryani's Institute) in the Temple of Atzoatl.
Doryani's Institute is the tier 3 incursion room of Zalatl, Architect of Thaumaturgy.
The room contains a device called Lapidary Lens that "double corrupts" a skill or a support gem. The room also contains Thaumaturgy Vessels containing gems and Gemcutter's Prisms.
It is capable of creating, and the only way (other than divination cards) to acquire gems that are two of the following:
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