watch
Reuters Photographer

Since it was invented over 200 years ago, the wristwatch has been an integral component of fashion.

In addition to their practical functionality of telling time, a watch serves as a collectible piece of art that communicates the personality and style of its wearer.

With the help of Crown & Caliber, an Atlanta-based pre-owned luxury-watch marketplace, we’ve put together a list and commentary about the wristwatches worn by nine of the most powerful CEOs in the tech industry.

Melissa Mayer, former CEO of Yahoo

Melissa Mayer, former CEO of Yahoo
Zimbio

The Wisconsin native was appointed the head of Yahoo in 2012 following a 13-year career at Google. Verizon officially closed its $4.48 billion purchase of Yahoo, the company announced Tuesday. Mayer will step down with a $23 million package.

Omega Deville Symbol Quartz — $4,900

Omega Deville Symbol Quartz — $4,900

ebay

Mayer’s watch, an Omega Deville Symbol Quartz, retails for $4,900 but can be purchased pre-owned on Portero, a watch marketplace, for $985.

Tim Cook, CEO of Apple

Tim Cook, CEO of Apple

AP

Apple’s market cap surpassed $800 billion in May. As such, the iPhone-maker is one of the world’s most valuable companies. And the man at the helm of it all is Tim Cook. He assumed the position as CEO in 2011.

Apple Watch — $269

Apple Watch — $269
Business Insider

Cook is rarely seen without his Apple Watch. You can purchase one on Apple’s website. They retail starting at $269.

Jeff Bezos, CEO of Amazon

Jeff Bezos, CEO of Amazon
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Jeff Bezos is the founder, chairman, and CEO of Amazon.com. Bezos’ net worth has soared with Amazon’s stock price. It stands at $82.3 billion, according to Forbes.

Amazon’s stock has been climbing because of the proliferation of Amazon Web Services, Amazon’s cloud-computing service. Its market cap stands at $465 billion. Amazon on Friday announced a $13.7 billion deal to buy Whole Foods.

Ulysse Nardin Dual Time — $11,400

Ulysse Nardin Dual Time — $11,400
Crown & Caliber

Bezos has often been photographed wearing an Ulysse Nardin Dual Time. A version of this watch retails brand new for $11,400, but can be purchased pre-owned on Jomashop for $6,595.

Larry Ellison, former CEO of Oracle

Larry Ellison, former CEO of Oracle
RICHEST TECH

Larry Ellison founded Oracle, the software technology company, in 1977. He served as the company’s CEO until 2014. The…