diamond ring

noun2

1. •
   By extension, an engagement ring, usually one given by a man to a woman.

   • If it were not a tradition that a woman shall accept from her fiance a diamond ring which the idiot cannot, in all probability, afford to give her — well, women would not accept them. — 1923
2. •
   An optical phenomenon visible during a moment of a solar eclipse when only a tiny part of the sun is not obscured by the moon, shining like a diamond in the ring of the sun’s corona.