Kourtney Kardashian’s left finger is certainly the most interesting to look at.

Travis Barker proposed to the Poosh founder during a romantic beach dinner date on Sunday, popping the question with an enormous diamond ring.

"It appears Travis has bought into the Kardashian family philosophy of going big and going flashy with the enormous oval-cut diamond engagement ring he gave to Kourtney. It looks to be larger than 15 carats in a pavé or hidden halo setting," Mike Fried, CEO of The Diamond Pro, told Page Six Style, valuing the sparkler at a whopping $1 million.

Olivia Landau, GIA-certified gemologist and founder of The Clear Cut, estimates that the eldest Kardashian sister’s sparkler is slightly smaller — "around 8 to 10 carats," she told us.

KOURTNEY KARDASHIAN, TRAVIS BARKER ENGAGEMENT HAS SCOTT DISICK 'GOING CRAZY': REPORT

"It is set in a skinny platinum solitaire style with a pavé diamond band. Depending on actual size and quality it could range between $350,000 and $650,000," she added.

Similarly, Kathryn Money, SVP of merchandising and retail for Brilliant Earth, places the diamond’s size at around 10 to 12 carats, with a value somewhere between $500,000 to $1 million.

KOURTNEY KARDASHIAN AND TRAVIS BARKER ENGAGED

Kourtney Kardashian

The former 'Keeping Up With The Kardashians' star and Blink-182 drummer are calling themselves ‘Kravis.’ (Getty Images)

Barker, 45, has been dating Kardashian, 42, since January, though they’ve been friends and neighbors for many years.

The Blink-182 drummer was previously married to Melissa Kennedy from 2001 to 2002, and Shanna Moakler from 2004 to 2008. He shares two children — Landon, 18, and Alabama, 15 — with the latter.

Travis Barker and Kourtney Kardashian are now engaged. (Photo by Noam Galai)

This will be the first marriage for Kardashian, who dated Scott Disick on and off for many years. The duo share three children together – Mason, 11, Penelope, 9, and Reign, 6.

In a 2011 episode of "Kourtney and Kim Take New York," Disick actually picked out a yellow diamond engagement ring, though Kourtney dismissed his informal proposal.

CLICK HERE TO SIGN UP FOR OUR ENTERTAINMENT NEWSLETTER

The engagement ring is just the latest way Barker and Kardashian have shown their commitment to one another; the rocker already has a few tattoos dedicated to his lady love, including her name near his heart and a thigh tattoo of the words "You’re So Cool!" from "True Romance."

Kourtney Kardashian and Travis Barker got engaged at a beachside hotel and Barker went all out for the occasion. (Photo by Jeff Bottari/Zuffa LLC)

The reality star even took her own turn at the tattoo gun, inking "I love you" in her own handwriting on Barker’s arm.

 CLICK HERE TO GET THE FOX NEWS APP

There’s no word yet of when or where the wedding will be, but one thing’s for sure: If it’s as over-the-top as her engagement ring, fans can expect a seriously major celebration.