court-dress jewels
玘 refers specifically to jewels used as ornaments on court attire, emphasizing their decorative and formal role.
玘 combines 王 (jade/jewel) with 己, which likely contributes a phonetic element. The exact historical development is uncertain, but the structure points to a jewel-related character.
The left side 王 (jade) shows it's a jewel, and the right side 己 looks like a fancy clasp or setting. Imagine a court official fastening a jeweled clasp onto ceremonial robes.
For キ, picture a key (キー) made of jade, used to unlock a treasure chest of court jewels. The key's sound cues キ.