Prism Spectacles

 are an accessory in. Clear both the Sun Stone sidequest and The Rainbow Shell sidequest and Melchior will combine the two items to produce the Prism Spectacles and Rainbow. Along with Prism Helm and Prism Dress, these psychedelic lenses are one of three non-offensive items created from the Rainbow Shell. Steel Shade can be charmed by Ayla for this item.

Trivia
The origin of the name: the main ingredient appears to be the Rainbow Shell, so  in the name makes sense.  is the standard shorthand for "rainbow" in the English version of the game, while specs is shorthand for spectacles, a synonym for.