"The Oura Ring 4 is available in six finishes: silver, black, brushed silver, stealth, gold and rose gold. But some finishes cost more than others. While silver and black are available at the $349 (£349, AU$569) starting price, brushed silver and stealth cost $399, and gold and rose gold are $499."

For the greater part of this past summer, I wore six smart rings at once. I wanted to see which was best, and the Oura Ring Gen 3 was the clear winner. Well, it’s been about two weeks since my experiment ended, and there’s now a new winner: the Oura Ring 4.

Smart rings are a fast-growing faction of the fitness tracker industry, and one company can be largely credited with putting these discreet wearables on the map: Oura. So, it shouldn't come as a surprise that the brand's Oura Ring 4 is the best smart ring you can buy.