US/Canada sizing:
Medium fits sizes 5-7.
Large fits sizes 7-9.
FAQ: Why does each size encompass 3 ring sizes?
This triangle ring is only touching 3 sides of your finger rather than the traditional circle which wraps around, I've designed the triangle to hug your finger with enough tension so that it stays but not too much that it hurts. So there is more wiggle room compared to your traditional circle ring when it comes to sizing.
Because of its unique shape, you'll have to try the sizing for yourself. If by chance it doesn't fit well, I have free return and exchange within 60 days!