The effect is named after the shape and sparkle emitted as the moon covers the sun:
The diamond ring effects are seen when only one or two beads are left, appearing as shining “diamonds” set in a bright ring around the lunar silhouette.
Wikipedia
Wikipedia contributors. 2024a. “Baily’s Beads.” Wikipedia, The Free Encyclopedia. May 2, 2024. https://en.wikipedia.org/w/index.php?title=Baily%27s_beads&oldid=1221815833.
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