Acceptable gems in red sockets include:

Champion's Monarch Topaz
Glimmering Monarch Topaz
Stalwart Monarch Topaz
Resolute Monarch Topaz (<- Weakest Option)

Sovereign Twilight Opal
Defender's Twilight Opal
Regal Twilight Opal
Guardian's Twilight Opal (<- Weakest Option)
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Rinforce | Rinforze