
"Snake" bracelet watch, Bulgari —
This emerald and gold coiled serpent wristwatch, made by Bulgari in 1961, once belonged to the actress Elizabeth Taylor, and sold for $974,500 at a Christie's auction in 2011.

Nature Triomphante Lierre de Paris, Boucheron —
This secret watch, made of white gold and diamond, wraps around the wrist three times, with the dial hidden beneath a central diamond-encrusted ivy leaf.

Les Éternelles de Chanel secret watch, Chanel —
This secret watch in 18-karat white gold from Chanel is a one-of-a-kind sparkler. Set with a 5-carat pear-cut diamond at the end, it features a further seven fancy-cut diamonds and 1,361 brilliant-cut diamonds.

Les Éternelles de Chanel secret necklace watch transformable, Chanel —
This 18-karat white gold secret watch can be worn as a necklace or a bracelet. It is set with a 10-carat round-cut Fancy Brown Yellow diamond, 75 Indonesian cultured pearls and 502 brilliant-cut diamonds.

Princess Butterfly, Graff Diamonds —
This watch has a mother-of-pearl dial hidden beneath a jeweled mechanism, designed in the shape of a butterfly. Graff Diamonds design director Anne-Eva Geffroy says secret watches like this appeal to clients who enjoy the intrigue and element of surprise.

Princess Butterfly, Graff Diamonds —
"By the very nature of their design, the gemstones incorporated and the way in which they are set, each watch is a masterpiece," says Geffroy.

My Precious Time, Harry Winston —
This 18-karat white gold secret timepiece is set within a brooch, with the dial revealed by pressing on a marquise-cut diamond.

Cerf-Volant long necklace watch, Van Cleef & Arpels —
This single-edition secret timepiece is worn around the neck and includes round, square and baguette-cut diamonds, rubies, onyx, and mother-of-pearl.

Cerf-Volant long necklace watch, Van Cleef & Arpels —
Pressing on the cabochon-cut ruby that sits atop the timepiece lowers the lid of the case, which in turn reveals a mirror that reflects the watch's dial.

Heure Marine, Van Cleef & Arpels —
The diamond cap on this bracelet is opened by pressing an emerald cabochon and reveals a mother of pearl dial hidden beneath. Part of the maison's Seven Seas collection, the watch is made from white and yellow gold, round, pear and baguette-cut diamonds, onyx, baguette-cut sapphires and an emerald.

Mosaico, Giampiero Bodino —
Italian jeweler Giampiero Bodino unveiled three elaborately embellished secret watches during Paris Haute Couture Week in January 2017.

Primavera, Giampiero Bodino —
The diamond-set dial on this white and yellow gold watch is hidden beneath an elaborate flower adorned with white, yellow, cognac and gray diamonds, pink sapphires and emeralds.

Rosa Del Venti, Giampiero Bodino —
The pavé diamond dial on this watch is hidden beneath an 11.49-carat cabochon emerald, and surrounded by colored sapphires, emeralds and rubies.

Médor Secrète, Hermès —
"The best pieces are first and foremost beautiful pieces of jewelry that happened to have a timepiece inside," says Jonathan Darracott, global head of watches at auction house Bonhams.

Caméléon secret hour watch, Cartier —
Made from white gold and set with tourmalines, turquoises, onyx and diamonds, this secret watch's dial is hidden by a single 16.18-carat round green tourmaline.

Diamond Outrage, Audemars Piguet —
The spikes on this watch, set with diamonds and sapphire, are designed to reflect the Alpine peaks of the Le Brassus region of Switzerland, where Audemars Piguet watches are made.

Diamond Fury, Audemars Piguet —
The Diamond Fury secret watch is crafted from an 18-karat white gold bracelet set with 4,635 brilliant-cut diamonds. The hidden dial is set with a further 206 brilliant-cut diamonds.



