Baily's Beads : The appearance of bright patches during a solar eclipse :: Diamond Ring effect : ?

Baily’s Beads are bright little spots that appear when the Sun’s light shines through valleys on the Moon’s edge just before or after a total eclipse. The Diamond Ring effect is the final bright flash that occurs right before the Sun disappears completely (or reappears) during a total eclipse. It happens when the last bead of sunlight shines through a deep lunar valley, creating a single bright point surrounded by the darkened Moon, giving the impression of a diamond ring. The same geometry that produces the beads also creates the ring, but the ring is a single, very bright spot that looks like a diamond on a ring of darkness. For example, during the 2017 “Great American Eclipse,” viewers saw a brilliant diamond ring just before the Sun vanished behind the Moon.