Previously unseen colours of the Moto 360 have surfaced through a leak on Amazon.

The smartwatch appeared on the online retailer's website briefly before being removed, Digital Spy reports citing Droid Life.

The first two are champagne-coloured devices with a steel band, available in 18mm and 23mm for $299.99 with a choice of black or gold watchfaces.

Meanwhile, the third features a cognac strap made from leather and a black clockface, costing $249.

Motorola recently issued a software update for the Moto 360 which introduced a low energy mode that kicks in when the device drops to 15% power.

Lenovo completed its acquisition of Motorola Mobility earlier today (October 30), taking ownership from Google.