I am not sure about the correct name of this ‘bug’ and even whether it was a bug, but it used to be so that when you equip an item with str/dex bonus it applied itself to your attributes, and the item would not become unusable even if you unequipped some other str/dex buffing jewellery or charms. In other words, the item would “hold itself”.
Now this ‘bug’ seems to be not working. Anyone knows whether it has been ‘corrected’?
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Yea, i was astonished myself, that this didn’t work. I could swear it works back in original D2. But well…many years between…my memory could cheat on me there…
I just tried it on D2 LOD, with an Amazon level 75 and 20 strength, and armour and gear that required 55, 60 STR etc, and a ring with +200 STR, as soon as you remove the ring all other items go “red” and you lose all the stats they give you, eg Defence, Resists, etc, so as soon as you remove the ring, you lose the +200 STR, and you also lose all other gear that requires STR.
I even found a recommendation to use this bug(?) in one of the newest guides on Maxroll.gg – it means that it definitely worked even during beta… Unfortunately, devs seem to have decided not in its favour contrary to Andariel, cow king and Nihlathak portal. 
Question is: was the armour you tried on in D2 LOD giving you extra STR? If not, it worked as it should. But I am speaking about items which give you bonus str and/or dex. That allowed them to remain “green” even after you took off the ring (or charm).