finger ring
A ring worn on the finger. The cross-reference to 指輪 suggests it is a synonym or older term for a finger ring.
See also: 指輪
She was wearing a beautiful ring.
metal thimble
A metal thimble used in sewing, as indicated by the cross-reference to 指貫 (ゆびぬき).
See also: 指貫 (ゆびぬき)
finger-constricting ring (archaic)
Archaic use: a ring worn to constrict a finger, believed to make it slender and beautiful. Not in modern use.
When sewing, I put on a metal thimble to push the needle.
It is said that women in the past used finger-constricting rings to make their fingers look slender.
Compound of 指 (ゆび, 'finger') and 金 (かね, 'metal'), with rendaku voicing to がね. The exact historical derivation is uncertain, but the word likely originally referred to a metal ring or thimble.