Alexa Dell & Harrison Refoua engagement ring

Alexa Dell proudly flaunted her 12 carat emerald cut diamond set in a pavé halo on social media. Her rich father Michael is the founder and CEO of Dell Technologies.

The heiress, whose father is reported to be worth $23.5 billion and is the world's 37th richest man, couldn't disguise her joy, captioning a video of the brilliant diamond, 'He did excellent.'

And it's no surprise she's pleased with the efforts of her partner Harrison Refoua, given the ring's estimated value of $3 million.

'A 12-carat diamond engagement ring would likely start at $500,000, but could easily cost several million dollars dependent on its cut and brightness,' said Hamish Shephard, Founder of Bridebook.co.uk, the top wedding planning software and website. This engagement ring is most likely worth between $2 and $3 million.'

The Alexa Dell & Harrison Refoua engagement ring was delivered to the art collector and branding expert over a candlelit supper on the beach at her father's hotel, The Four Seasons in Kona, Hawaii.

Estimated Cost: $3 million