OK, this is long and based on my own research as a hobbyist, personal collector, and artist/seller. As such, it's not sourced or reviewed. But here's what I've learned through trial & error over the past few years.
What I've found in testing my jades are that it's area wax (either filling pores or lines) or allover color polish dip which has a middle range noticable glow under LW UV. It is noticable in that it doesn't seem to penetrate deeply or "through-and-through." But, disclosed color polish in area hasn't shown on LW UV.
B or B&C lavender jade I've seen has had a strong bright orange glow. Like- undeniably unnatural strong glow for jade (like a sherbet orange version of that red or pink ruby UV glow if you're familiar with it). B or B&C white jadeite will glow strongly throughout, with an unmistakable brightness. As in- it looks like a glowstick.
I do have confirmed A jadeite pieces with a very faint glow (usually yellow-orange off white) which exists only in spots (like a 2x2 mm blotch or streak) and that is for sure not wax filling because it's not associated with a broken or rough spot. I've never seen a grade A piece that glows entirely and through it's depths. Grade A usually just glows in: wax filled pores, stonelines & cracks, or in deeper parts of carvings; in polish dipped or polish waxed pieces; and rare exceptions of very faint naturally occurring UV reactivity.
I'm saying this all knowing which treatment tech I've seen that is detectable or disclosed. All of the B or B&C I've seen have had grade A certs that were obviously fake with mismatched details such as wrong weight or didn't match online databases. Color polish is always been noted under remarks on legit certs, but I believe color polish "dip" is not considered A grade (not certain on that though).
Lastly, nephrite or Hetian is always considered to be inert as far as my research has shown. I've never seen a glowy piece, of it nor have I seen nephrite with glowing pore or crack filling like jadeite (but I guess it could exist). Nephrite is a more widespread mineral than jadeite, and finding good quality (not cracked, not heavily porous) for jewelry pieces is easier than rough jadeite, and I've always assumed that's why there's not as much of a treatment market for it.
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I just reversed the navy on the 25mm Infinity to yellow for a cheery work week hehe! 
