This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
璙 combines 王 (jade) with 尞, which likely contributes the sound. The exact historical development is uncertain.
The left side 王 suggests jade or a precious stone, but the overall meaning is unclear. Imagine a mysterious jewel whose name has been lost.
For リョウ, picture a rare jewel named Ryo: Ryo -> リョウ, a precious stone with an uncertain story.