Board Thread:Wiki Discussions/@comment-27680652-20171003205220/@comment-24494906-20171223235704

王, 玉 and 玊 all turn into ⺩when composed to the left, so you can't tell them apart after composing.

琲 is not a Jouyou kanji and basically not in use at all (except when writing "coffee"), so obviously the standard word for "necklace" isn't written like that, but instead of wildly speculating, how about just consulting and believing a kanji dictionary on this matter?

The idea behind "not a king" is from this: 琲 -> 王に非ず