There are a few things you can do to get a rainbow ring on Instagram. The first is to follow the rainbow ring hashtag and post pictures of your ring with different colors in different places. The second is to post pictures of yourself wearing your ring and captioned with the hashtag #rainbowring. The third is to post pictures of rings that you have bought and share your thoughts on them. Finally, be sure to follow other people who are using Instagram for Rainbow Rings and share your ideas and photos too!