The "4 Ages of Man" Folio

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The ring from "the nose" could also show something different than prosperity or an ecclesiastical background:

Kieckhefer, Richard (2014). Magic In The Middle Ages (2. Ed.), Cambridge University Press, pp. 102-104

... One chronicle suggests that when gems were in proximity to poison they would break out in a kind of sweat. Such notions may seem fanciful, but clearly they were meant seriously. Thus, in 1408 the duke of Burgundy had a stone set in a ring as a means for detecting poison.
Quite often the magical power of the stone itself was enchanced by that of inscriptions. One example which in many ways typifies the tendency is a fourteenth-century ring from Italy ( Fig. 10a ).The ring itself is gold. It is set with a "toadstone". This stone, which counted as precious, allegedly came from the head of a toad, though actually it was a fossil derived from a certain kind of fish. ...

Toadstones were also called "Crapandina", and apparently used for some ailments ( e.g. snake-bites ). In general, stones were believed to be at least as powerful as herbs. The extraction of a toadstone is described You are not allowed to view links. Register or Login to view. in "Hortus sanitatis" (1497).

So it's not surprising that the ring is conspicuously shown towards the viewer.