This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
瓓 combines 王 (jade) with 闌, which likely contributes the sound ラン. The exact historical development is uncertain.
The left side 王 suggests jade or a precious stone, and the right side 闌 is a complex gate-like shape. Picture a rare, uncut gemstone locked behind an ornate gate, its meaning hidden.
For ラン, imagine a runner (ラン) sprinting through the gate 闌 to grab the jade 王: runner -> ラン.