beautiful jade, tinkle
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璆 centers on beautiful jade, with the tinkle meaning likely an extension of the sound jade ornaments make when they strike each other.
echoing beautifully (of the sound produced by striking together jewels or metals); beautiful (of a melody, etc.)
璆 combines 王 (jade) with 翏, which likely contributes the sound. The character is rare and its exact historical development is uncertain.
The left side 王 is the jade radical. Picture a beautiful jade ornament on the right side 翏, with its feathers and delicate lines suggesting the tinkling sound it makes.
For キュウ, imagine a beautiful jade pendant that makes a cute tinkling sound: cute -> キュウ, and the jade is beautiful.