All Samsung Ring sizes cost the same: $399 / £399 / around AU$750 (AU prices won’t be available until mid-October). However, there are slight differences in performance, based on ring size: the larger 12-13 sizes last for up to seven days of battery life, while the smaller sizes only last for six.

This news comes after rumors broke last week that Samsung will soon be offering size 14 and 15 options for its Galaxy Ring. According to a report from leaker Max Jambor, Samsung is set to offer the new sizes at some stage in "the coming weeks". If Jambor's report is accurate, it sounds like Samsung will beat Circular to market with the new sizing.

The smart ring landscape includes more options than ever. We compare the Ultrahuman Ring Air vs Samsung Galaxy Ring to help narrow the field.

Samsung is reportedly working on two additional sizes for the Galaxy Ring so that it fits everyone's finger without any problems.

The Circular Ring Slim weighs 2 grams, slightly less than the Galaxy Ring (2.3-3 grams depending on the size), and is 0.4mm thinner than the Galaxy Ring at 2.2mm. However, housing all the sensors in an indent at the bottom of the ring makes it feel more clunky on the finger and affects the quality of the metrics.