The Oura Ring 4 jumps in price to $349/£349 for a standard model, which rises more depending on the finish. The gold, pictured here, costs $499/£499. With the Oura Ring Gen 3 going end-of-life, the upshot is that the smart ring just got $50 more expensive.

"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."

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.