5 of the best transformer jewels for your capsule collection

Why carry a trunkful of diamonds on every trip when just one clever multi-tasking piece will do? Thanks to these genius designs from Cartier, Chanel and Boucheron, your yachting wardrobe just got a whole lot lighter.

Vintage Cartier bar brooch

Comprised of five shield-shaped diamond clips, this Cartier brooch dating from 1934 is a rare example of one of the brand's early 'novelty' jewels and is being auctioned by Bonham's on December 5, 2015. Totalling 15 carats, the diamond clips are set on a hinged bar allowing the piece to transform into a brooch, bracelet, epaulette or hair jewel.

Estimate: £15,000 - 20,000, bonhams.com

Billed as the world's most valuable transformable jewel, Graff's The Fascination boasts 152.96 carats of pure white diamonds and can be worn as a watch, bracelet or ring. The key to its transformation is ingeniously simple. A 38.13 carat pear-cut diamond - one of the world's rarest diamonds available to buy - fits into a bespoke ring shank or slots perfectly over the face of this exquisite timepiece.

Estimated value of $40 million, graffdiamonds.com

Every woman should feel like royalty in her finest jewels and there’s no doubt Boucheron’s glittering diamond tiara will achieve just that. Inspired by the frozen plains of Russia and the house’s historical relationship with key figures of the Empire, this is opulence best saved for special occasions. And when the event calls for something a little more low-key? Simply flip the tiara and wear as an elegant necklace.

Price on application, boucheron.com

One of a number of unique pieces designed by Cartier specifically to celebrate rare and exquisite stones, the 30.21 carat pear-cut Pur Absolu diamond can become a show-stopping necklace, ring or pendant thanks to over 1000 hours of work from the house’s finest craftsmen. In its most dazzling form, the diamond is surrounded by 7.26 carats of pear- and brilliant-cut diamonds and dangles from a natural grey pearl.

Price on application, rouge.cartier.co.uk

The ideal piece for those plagued by the choice between a bracelet and a watch, this elegant design by Chanel is the ultimate hybrid. Featuring an 18 karat white gold case, 318 diamonds totalling 2.41 carats and 194 Akoya cultured pearls, it is also long enough to be worn as a sautoir necklace and waterproof up to 30 metres for those impromptu swims.

$73,500, chanel.com