CNBC has reported that Mayer's luxury watch collection makes up around 25 per cent of his estimated US$40 million net worth, including several timepieces that could fetch seven figures at auction, thanks to their rarity.

Available in both white and black dial variations at USD 13500 on retail, the Ref.

The singer and Audemars Piguet celebrated the launch of their new $180k collab timepiece, the Royal Oak Perpetual Calendar "John Mayer" Limited Edition, with a party in Bel Air attended by celebrity watch lovers.

Yours for $180,700 USD. But perhaps the most striking feature is the watch's blue “Crystal Sky” faceted dial. “The brass dial plate is finished with a new scintillating pattern… composed of irregular shapes resembling crystals, whose sharp angles and facets add relief and brilliance to the piece,” said the brand.