Bling!

The guy who co-founded Skype -- and sold it for $2.6 BILLION -- claims he got the picture when he found out his fiancee allegedly cheated on him, and now he's suing to get the ridiculously expensive ring back.

Janus Friis claims in a new lawsuit, he got engaged to Maria Louise Joensen -- a Danish recording artist who goes by Aura Dione -- back in 2013. As a symbol of his love, he gave her a $471,000 engagement ring, an apartment and cash, but claims there were strings attached to the gifts ... they had to seal the deal.

Friis claims he learned she had "multiple affairs and sexual encounters with other men" and broke off the engagement. So now he wants his stuff back.

If Maria's holding on to the ring, it's pretty obvious why ... Janus describes it as a 950 Platinum band inset with a number of diamonds, including a 1.76 ct round brilliant cut diamond -- D color, internally flawless, excellent symmetry and cut grade.

The ring also has a pair of blue pear shaped diamonds of South African origins with a collective weight of .91 ct.

Friis wants minimum $1 million.

Imagine you're out of work and looking for a paycheck ... and then you stumble upon a HUGE DIAMOND EARRING -- would you give it back???

Lucky for Dez Bryant, the man who found HIS diamond after it fell out during a Dallas Cowboys practice yesterday isn't you.

The guy with the golden heart is Miguel Preciado ... who's been volunteering at the Cowboys practice facility in Oxnard, CA while looking for a permanent job.

Preciado tells us ... he NEVER (not even for a second) considered keeping the diamond and selling it ... even though hawking it could've brought in THOUSANDS of dollars.

"I'm just a volunteer who did the right thing that I would have wanted done for me," Miguel tells us.

When Miguel gave the diamond to #88 -- Bryant insinuated he'd be hooking up Miguel with some sort of a reward, but Miguel says the move was never about money -- he just wanted to do what's right.

Jennifer Aniston is back from Bora Bora ... proudly displaying the symbol of marriage.

Jen showed up at the premiere of her new movie, "She's Funny That Way," with a diamond encrusted gold wedding band.

She wasn't wearing her engagement ring, maybe to showcase the new bling.

Julianne Hough is excitedly announcing she's freshly engaged to Washington Capitals star Brooks Laich -- but, oddly, she's not giving up the goods!

The "Dancing With the Stars" judge has been dating Laich -- a center with the Caps -- since 2013. She announced their engagement on Instagram by posting a pic that does NOT show Brooks' face or the ring ... the only 2 things every woman wants to see.

She said, "We are overwhelmed with joy and excitement to share with you our recent engagement! #fiancé #love"

That's sweet and all, but here's what you really want to see -- Brooks' face. Judge away, ladies.

Drake is set to shut down Toronto with his performance at OVO Fest tonight ... and when he hits the stage, he'll likely be rockin' some new ice.

Drizzy hit up social media last night and posted a pic of a diamond encrusted "championship" ring ... made by celeb jeweler Dave Bling ... who's hooked up huge star athletes and musicians.

What could Drake possibly be celebrating? Maybe the total obliteration of rap foe Meek Mill -- which is earning him huge props from almost everyone -- including athletes like Odell Beckham Jr. and Brandon Jennings.

Ohio State Buckeyes star Cardale Jones currently makes ZERO dollars as a college athlete ... but this baller on a college budget has a nice little jewelry collection.

Jones posted a "sneak preview" of what he's planning to rock to the ESPYs tonight -- a collection composed of a Gucci watch, Louis Vuitton shades, gold chains, another gold Invicta watch, diamond earrings and a gold belt buckle.

Oh, and his National Championship ring.

For some reason, Jones pulled the video off his Instagram after some of his followers began to question how he could afford such fancy stuff on his NCAA income.

But here's the deal ... at the end of the day ... it might not even be his stuff. Or it could be fake.

Or maybe he's done really well in the stock market.

2 Chainz and Flo Rida squared off at this weekend's BET Awards ... and one of them won by a neck.

Both showed up with giant jewel-encrusted chains ... it's debatable who's got the bigger and badder bling ... but both look like they could cover a kid's college tuition.

One thing's for sure ... sometimes one is enough ... even for 2 Chainz.

New York Giants linebacker J.T. Thomas believes in the "Treat Yo Self" mentality ... because after he inked his new $12 MILLION contract ... he picked up $55k in brand new bling ... TMZ Sports has learned.

Thomas hit up Avianne and Co. in NYC -- and scored himself an 18 karat gold Cuban link chain for $35k.

And because he didn't want that chain to get lonely, he got a 2nd piece ... a 25 karat ruby, surrounded by diamonds ... which ran him another $20k.

Tom Haverford would be proud ...

Diamond studded King Tut is out, diamond studded Anubis is wayyy in -- so says NBA star Trevor Ariza ... who just dropped $12,000 on a brand new jackal-headed gold piece ... TMZ Sports has learned.

The Rockets star hit up Johnny's Custom Jewelry in Houston looking for something cool -- and according to the brother of the owner, Zo, asked for a piece with an ancient Egyptian theme.

But Zo says Ariza was tired of seeing King Tut everywhere ... and wanted something a little more original. So he crafted an 18-karat design of Anubis -- a god who ushered souls into the afterlife.

Bonus Egyptian Joke -- What's a mummy's favorite kind of music? Wrap.

Iggy Azalea is officially on her way to becoming Mrs. Swaggy P-- her NBA star boyfriend Nick Young popped the question ... and she said, "Yes!"

It all went down at Nick Young's 30th birthday party Monday night -- with the L.A. Lakers star getting down on one knee and busting out a fat 10 carat yellow diamond ring.

The two started dating back in 2013 -- for their first date, Nick took her to a Target to go shoppping.

From there, they hit it off quickly -- with Nick once taking her home from a club and bragging, "What I'm about to do with this shouldn't be legal!"

Soooo ... congrats!!!

John Mayer just got his clock cleaned in a lawsuit in which he claimed he was defrauded by a watch dealer ... because John has not only dismissed his suit ... he now says his claims were false.

TMZ has obtained a joint statement between Mayer and Robert Maron, who sold the singer more than $600,000 worth of Rolex watches back in 2007. Mayer -- a big-time watch collector -- claimed the watches had counterfeit parts and Maron knew it.

Now we've learned Mayer has dismissed his lawsuit and no money or property changed hands. What's more, their joint statement says, "Two years of research restored John Mayer's belief that Bob Maron is an expert on Rolex watches, and confirmed that Bob Maron never sold him a counterfeit watch."

Maron's lawyer, Eric George, said early on he'd beat Mayer in court, but the dismissal is pretty much the same as a jury victory for Maron.

BTW ... Maron is best buds with Charlie Sheen and even had a co-executive producer title on "Anger Management."

Floyd Mayweather is flossin' a ridiculously rare man-bag ... and it costs more than your CAR!!!!

The boxer just touched down in Georgia this morning ... flaunting one of his favorite expensive purchases -- a diamond Hermès HAC 50 bag made out of crocodile skin.

We spoke to someone from Hermès who told us the bag isn't being sold in stores -- and therefore, it MUST be a custom job (Pharrell had a custom Hermès bag made in 2007).

So, we went to the The Money Team looking for answers ... and one of Floyd's top TMT guys told us Floyd paid around $150k for the bag, which is accented with 245 diamonds on the metal hardware.

It's a drop in the bucket for Floyd who claimed he made around $200 million for the Pacquiao fight.

And he's not done spending yet ... Floyd tweeted to his people in Atlanta -- "Anyone know what time the stores open up? I need to pick up a few items for the [Atlanta Hawks] game tonight."

Hip-hop honcho J. Prince nearly came up snake eyes in Las Vegas -- losing a $75,000 diamond encrusted watch in the airport -- until a stranger came forward to save the day ... and then Prince made his.

Sources connected to the Rap-A-Lot Records chief -- and infamous Drake defender -- tell us he had just gone through TSA Tuesday night when he noticed his iced out Hublot was missing.

With $75k on the line ... you better believe Prince's crew immediately scoured the terminal - and while they were searching, we're told a dude walked up and whipped out the watch. Witnesses say Prince's security surrounded him to confirm it was the right one, and that's when the awesomeness happened.

In the video ... you see Prince walk up to the good Samaritan and hand him something. We're told he reached into his pocket for some loose change to reward the guy -- and by loose change we mean ... $500!!

So grateful. So baller. Jewelry recovery is really becoming J. Prince's thing -- right, Stevie Francis?

Here it is ... the $1 million emerald-studded WBC championship belt that Floyd Mayweather and Manny Pacquiao will be fighting for on May 2nd ... in addition to their $100-million + paychecks!

TMZ Sports broke the story ... the World Boxing Council commissioned the belt when the fight was announced .. and adorned it with 3,000 real miniature emeralds.

The belt was revealed at a WBC event in Mexico -- and will make its way to Vegas this week ... escorted by a private security team.

The MILLION DOLLAR championship belt that will be awarded to the winner of Mayweather vs. Pacquiao has its own private security detail that will escort it from Mexico to Vegas ... TMZ Sports has learned.

A rep for the World Boxing Council tells us ... the belt -- which is encrusted with more than 3,000 real miniature emeralds -- will be unveiled on Monday in Mexico ... at WBC headquarters.

After it makes its public debut, the belt will travel to the MGM Grand -- escorted by the President of the World Boxing Council and 2 private security guards.

Ultimately, the belt will be handed over to MGM officials -- who will safeguard the belt in a special case until the night of the fight.

It looks like an engagement ring ... she's flaunting it like an engagement ring ... but the rock on Erin Andrews' finger is NOT an engagement ring.

Andrews has been dating L.A. Kings superstar Jarret Stoll for a while ... after she posted a pic with that huge diamond before last night's "Dancing with the Stars" premiere, there was buzz that he finally popped the question.

Turns out ... the ring wasn't from Stoll -- it was from wardrobe ... specifically so Erin would look "blinged out" for the big show.

But the ring was no cheap prop -- according to E!, it was a special asscher-cut diamond ring that weighed in at 2.01 carats with 22 baguette diamonds and 88 other microset diamonds.