You know it’s bleached when you can see spider web on the surface-that is either a bad bleaching job or a 5-year old one because it loses luster (gloss?) after a long time. And if it is old, you can sometimes spot “clear spots” as if you see quartz veins in some stones like amethyst or agate (druzy agate is a good example); except quartz is not mixed in jade. So, those spots are the voids left behind by the bleaching-and if it is injected with polymer, you can see those voids turn off color like yellowish (in highly translucent jade it even gives you the impression of?floating “cloud”). In the second photo of my lots, you can see the grey spots in the inner wall and one or two on the outer surface. And a dead give away is how light it feels for that thickness and width: agate bangle always feel much lighter than a nephrite bangle for the same outer diameter and width even if their differences in specific gravity is not that much: 2.95 for nephrite and 2.6 for agate. And you know agate stone (not its weight or SG) just has that feel to it when you hold it in your palm.