diamond ring

名词noun

1. 1Used other than figuratively or idiomatically: see diamond,‎ ring.
2. 2By extension, an engagement ring, usually one given by a man to a woman.
3. 3(astronomy) 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.