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rings could be considered permanent if undisturbed they are often likely to vanish due to their fragility. Some rings may be fixed in place and firmly attached to the stem whilst others may be movable or mobile with the ability to slide up and down the stem either by hand or just falling down naturally with age. Fragile and movable rings can appear to vanish so examining the stem for traces of a ring zone (or annular zone) or the base for a detached ring can sometimes be helpful. Various combinations of these terms can be used to best describe

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