Tier 1 shows any rarity (they're crafting bases). Tier 1.5, Tier 2, and Lower all require Rare or better.
Shields
Shield lines follow the same 6 defence types as armour: Tower Shield = Str, Round Shield = Str-Dex, Buckler = Dex, Spiked Shield = Dex-Int, Spirit Shield = Int, Kite Shield = Str-Int. Top shows any rarity; Lower requires Rare+.