I use size 10 cotton crochet thread from the brands daiso and aunt lydia, any brand and fiber content works for these. You will also need a US size 1 crochet hook, pliers and earring hooks. These are customizable to any length and combination of colors.

the pdf StackedHeartsEarrings1Page is designed for easy printing, it prints in one page in black and white and is colorblind accessible

the pdf StackedHeartsEarringsLargePrint is designed for people with low vision, it prints in three pages, with the first two black and white and the last page in color.