Russian luxury brand Caviar has announced 99 pieces of iPhone XS and XS Max models at the starting price of $8,370 (nearly Rs 5.8 lakh), that come with a mechanical watch and the dial protected by a sapphire crystal.

"We continue the history of the greatest mechanisms integrated into the smartphone design and a smartphone body which is complemented with a watch mechanism and a tourbillon," the company wrote on its website.

The "tourbillon" is a miniature, constantly rotating mechanism that compensates the gravity impact on the time reckoning.

Tourbillon is indeed a special height in the watch world – a tiny mechanism, called “vortex” in French, with its movement compensates the gravity error in the accuracy of the clock rate and ensures the perfect preciseness of the time reckoning,” Caviar said on the website.

The body of the limited-edition iPhones comes with a composite black titanium panel with white composite stone inserts and gold-plated elements.

“Keeping finding an inspiration in the traditions of watch complications, Caviar went further than the idea to combine a mechanic watch with a smartphone and developed a unique model, where the modern iPhone XS is complemented with a tourbillon – a mechanism providing the perfectly accurate time reckoning thanks to the leveling of the gravity impact on the watch work,” it said on the website.

The dial is said to consist of a set of circles inscribed into each other.

Caviar is selling 64GB, 256GB and 512GB variants of iPhone XS for $8,370 (Rs 5.8 lakh), $8,680 (Rs 6.01 lakh) and $9,060 (Rs 6.29 lakh), respectively.

The limited edition 64GB iPhone XS Max model could be purchased at $9,130 (Rs 6.3 lakh) for the 256GB and $9,440 (Rs 6.54 lakh) for the 512GB variant.

The company said it guarantees free worldwide shipping as well as easy returns and refunds.