Jewel Knuckles

Jewel Knuckles and Mirror Cuirass ealry in game
Go to the bottom of the outer wall. Kill the knight in purple and enter the room behind him. Knock down the wall at the left side and wait in the space for about 20 seconds. Don't overlap. Then, a purple, transparent platform will fall into the room below where there are the Jewel Knuckles and Mirror Cuirass. This means you don't have to wait until you get mist form to get them. Go back on the platform to go back up.