string of many pearls
琲 centers on a string of many pearls, evoking a connected line of lustrous beads.
琲 combines 王 (jade/jewel) with 非, which likely contributes the sound and possibly the idea of a row or sequence, giving 'string of pearls'.
The left side 王 (jewel) and right side 非 (which looks like two rows of three) together suggest a string of many pearls lined up.
For ハイ, imagine a string of pearls draped high around a neck: high -> ハイ, and the pearls hang in a long strand.