The Lucky Halo 2019 (also known as the St Patrick's Halo, or around some fan communities as the "gaylo") was available during the St. Patrick's event 2019 on Royale High from March 1st through to the 31st. It's design features white clouds arranged in a donut shape, with many different coloured flowers surrounding it, along with a rainbow donut in the center. The fountain stories (presumably) may not be of any importance to the luck of winning the halo. If the player was successful in winning the halo, their screen would turn mint green.
If the player was successful in winning the Lucky Halo 2019, they would also receive the "After it rains..." badge. A total of 12848 users own it. The description reads "the sun comes out, friends come out, and we go on an adventure to chase the end of the rainbow."