Jost and Johansson were first spotted together in May 2017, and have had a low-key relationship ever since, minus the occasional "SNL" joke and red-carpet appearance.

They got engaged in May 2019, but the ring wasn't revealed until two months later.

Representatives for Rare Carat, a diamond search engine, told Business Insider in July 2019 that Johansson's diamond is an old cut that has great clarity, especially for a light-brown diamond, and estimated the ring would cost $450,000.

Jost and Johansson tied the knot in October 2020, and they welcomed their son in August 2021.

The Duke and Duchess of Sussex announced their engagement to the world on November 27, 2017, with Markle debuting a three-stone diamond ring designed by Prince Harry and jeweler Cleave & Company.

People magazine reported that the ring features a 3-carat, cushion-cut center stone sourced from Botswana — a location of special significance to the couple — while the side stones are two round diamonds from Princess Diana's jewelry collection. Experts estimated it cost $350,000.

The couple married the following May and now reside in California with their two children.

Kate Middleton's unique 12-carat sapphire — surrounded by diamonds, no less — popped perfectly with her navy dress when the royal couple announced their engagement in 2010.

The $500,000 heirloom might not be the most expensive ring on the list, but its sentimental value is worth much more. Princess Diana famously wore this ring while she was engaged to Prince Charles.

The pair wed in April 2011 and have since welcomed three children.

Shelton and Stefani got engaged in October 2020 after five years of dating, and they announced the happy news with matching posts on Instagram.

But the "Hollaback Girl" singer didn't give fans a closer look at her ring until a few weeks later on her Instagram story.

"We're looking at a gorgeous 8-carat, radiant-shape diamond with trapezoid sides — an Art Deco look," Rare Carat founder and CEO Ajay Anand told BI in November 2020. "We're talking $500,000 in all, as the center stone is an icy white D-to-F color diamond."

Lady Gaga never ended up saying "I do" to "Chicago Fire" star Taylor Kinney, who proposed in 2015 on Valentine's Day with a 6-carat, heart-shaped diamond ring by Lorraine Schwartz.

The $500,000 ring had a micro-pavé platinum band and was engraved with "T ♡ S," which stands for Gaga's birth name, Stefani Germanotta.

The couple split in summer 2016, but seemingly remained friendly, with Kinney telling Entertainment Tonight in 2019 that "the sky is the limit" for Gaga after her success with "A Star Is Born."

The San Francisco 49ers running back proposed to the model and former Miss Universe winner in April 2023 after almost four years of dating with a three-stone ring designed by Ring Concierge.

Nicole Wegman, Ring Concierge's founder and CEO, told People, "We worked with Christian to thoughtfully design a ring that encompassed Olivia's trendsetting style while still remaining timeless — a beautifully cut Oval flanked with Epaulette side stones in a handcrafted gold and platinum setting." It's estimated that the ring is worth $600,000.

The pair tied the knot in June 2024 in a lavish Rhode Island ceremony.

Actor George Clooney proposed to British international human rights lawyer Amal Alamuddin (now Clooney) with a 7-carat, emerald-cut diamond.

The solitaire ring, which features side baguettes set in platinum, is worth an estimated $750,000.

The couple publicly revealed their engagement in April 2014, and by September of that year, they had tied the knot. They later welcomed twins in 2017.

In February 2010, professional hockey player Mike Comrie proposed to Hilary Duff while the pair were on vacation in Maui.

E! News reported, per Forbes, at the time that Duff's 14-carat, princess-cut ring cost $1 million.

The couple kept their engagement short, marrying in August of that year. They later welcomed their son in 2012 before announcing their separation in 2014. The couple's divorce was finalized in February 2016.

Duff has since gone on to marry musician Matthew Koma, with whom she shares three daughters.

In 2016, Gucci Mane proposed to entrepreneur Keyshia Ka'oir during an Atlanta Hawks game with a 25-carat, cushion-cut diamond ring.

And three years later, the rapper decided to up the ante with a whopping $1 million, 60-carat round-cut diamond creation by Pristine Jewelers Ben Shimon and Avi Davidov, BET reported.

The outlet added that it took the jewelers 45 days to complete the ring.

The couple wed in October 2017 and have since welcomed two children.

Michael Douglas did pretty well choosing a $1 million antique Fred Leighton 10-carat engagement ring for Catherine Zeta-Jones, and their relationship isn't so bad either — the actors have been together for more than 20 years and have two children.

Blink-182 drummer Travis Barker proposed to Poosh founder Kourtney Kardashian in October 2021 with an engagement ring designed by Lorraine Schwartz.

"It's a flawless, beautifully cut diamond stone," Schwartz told People.

Kathryn Money, SVP of Merchandising and Retail at Brilliant Earth, told Brides that the center stone — an elongated oval solitaire diamond — is likely 10 to 12 carats with an estimated cost between $500,000 and $1 million.

The pair went on to host three weddings — in Las Vegas, Santa Barbara, and Portofino, Italy — throughout 2022. They welcomed their son in November 2023.

In August 2012, Justin Theroux asked for Jennifer Aniston's hand with a $1 million 10-carat diamond ring designed by her friend Jennifer Meyer, E! Online reported.

The couple announced their divorce in February 2018, but remain close friends.

In July 2020, Demi Lovato announced her engagement to actor Max Ehrich on Instagram.

Rare Carat CEO Ajay Anand told BI that the ring appeared "to feature a 10-carat, emerald-cut stone" and estimated that it "would sell for no less than $1 million."

But Lovato and Ehrich's engagement was short lived — they split just two months later in September 2020.

"I think I rushed into something that I thought I was supposed to do," Lovato said in her 2021 documentary "Dancing with the Devil," adding, "I realized as time went on that I didn't actually know the person I was engaged to."

Lovato is now engaged to musician Jordan 'Jutes' Lutes.

Gabrielle Union said yes to former NBA star Dwyane Wade and the $1 million 8.5-carat, cushion-cut diamond he chose for her.

The couple married in 2014 and welcomed a daughter via surrogate in 2018. Union is also stepmother to Wade's three children.

Lady Gaga has her mother to thank for her fiancé, businessman and philanthropist Michael Polansky.

Gaga told Vogue in September 2024, "My mom met him and she said to me, 'I think I just met your husband,' and I said, 'I'm not ready to meet my husband!'"

The pair officially met in December 2019 and got engaged in April 2024, the outlet reported. For the occasion, Polansky chose a large oval-cut diamond set on a pavé band.

Zack Stone, CEO of UK-based jewelry retailer Steven Stone, told InStyle in December 2024 that the ring appears to be 15 carats and estimated that it was worth around $1.25 million.

Justin originally proposed to Hailey in July 2018 with an 18-carat Solow & Co engagement ring, Vogue reported.

However, six years later, the "Peaches" singer decided to upgrade the Rhode founder's ring, this time selecting a piece by Lorraine Schwartz that she debuted on her Instagram in May 2024.

After tabloid speculation about the new ring's size, Hailey Bieber told W Magazine in July 2024 that her new bauble "is only one carat bigger" than her original ring. "It's just elongated," she said. It's estimated that the upgraded ring cost $1.5 million.

The couple have been married since September 2018 and welcomed their first child in August 2024.

In 2016, model Kate Upton said yes to MLB pitcher Justin Verlander and a one-of-a-kind ring by Anita Ko, featuring an 8-carat, round-cut diamond in a unique six-prong setting that was estimated to cost $1.5 million.

The couple have been married since 2017 and they share one daughter.

Tom Cruise proposed to Katie Holmes with a 5-carat rock in 2005.

The center oval-cut diamond was surrounded by another 6 carats of diamonds and has been estimated to cost as much as $1.5 million, per Who What Wear.

They welcomed their daughter in 2006 before splitting in 2012.

Kim Kardashian's marriage to Kris Humphries only lasted 72 days, and the best thing to come out of it was the 16-carat center diamond designed by Lorraine Schwartz.

While the ring was initially reported to be worth nearly $2 million, in 2013, when Humphries auctioned it off at a charity event, it went for $749,000.

Paris Hilton and M13 Ventures founder Carter Reum got engaged in February 2021.

The following month, Hilton shared on "On Air with Ryan Seacrest" that Reum designed the ring with Jean Dousset, the great-great-grandson of Louis Cartier.

"It is a three-stone ring design with an emerald-cut center stone, featuring baguette-cut and trapezoid accent diamonds," Dousset said in a 2021 interview with The Knot.

He added, "The design of the ring derives from a combination of classical and Art Nouveau era influences. The geometric shapes of this ring are befitting to resemble the structure of the Grand Palais in Paris." It's estimated that the ring cost $2 million.

The pair wed in November 2021 and share two children.

Before Reum, Hilton was engaged to actor Chris Zylka from January to November 2018.

Hilton kept the $2 million 20-carat pear-shaped diamond after their split, telling "The Jenny McCarthy Show" in December 2018, "The person who we got it from got millions and millions of dollars of free publicity, so I love how social media has basically become a new form of money. It's pretty sick."

"Diamonds are a girl's best friend," she added.

When NFL quarterback Russell Wilson put a ring on it, he made sure no one could miss the news by gifting Ciara a 16-carat round, brilliant-cut center diamond.

And that's not all — the center stone is flanked by a trapezoid-shaped and pear-shaped diamond on each side, bringing the ring's total estimated value to about $2 million, per The Knot.

They married in July 2016. They have three children together and also parent Ciara's son whom she had in her previous relationship.

Mariah Carey got engaged to Nick Cannon in 2008, who proposed with a 17-carat, emerald-cut pink diamond by Jacob & Co.

"I wanted to do something extremely special, something that Mariah would really appreciate," Cannon told People magazine at the time, adding, "We got the pinkest stone we could find, surrounded by other diamonds."

People reported that the center diamond was surrounded by 58 smaller pink diamonds and two half-moon diamonds, leading it to cost an estimated $2.5 million.

The two married in 2008 and had twins, but they got divorced in 2014. Cannon now has 12 children.

Blake Lively's trendy 12-carat, oval-cut diamond set in 18-carat rose gold was made by celebrity favorite Lorraine Schwartz and reportedly cost her husband, Ryan Reynolds, $2.5 million.

The two wed in 2012 and have four children.

The former first lady wed Aristotle Onassis, a Greek shipping magnate, in 1968.

He proposed with the Lesotho III diamond, a 40.42-carat, marquise-cut diamond.

The ring sold for $2.6 million at auction in 1996.

Reddit cofounder Alexis Ohanian proposed to 23-time Grand Slam champion Serena Williams with a $3 million 17-carat, emerald-cut engagement ring in December 2016, The New York Post reported.

The pair wed the following November in New Orleans and now share two daughters.

Current President-elect Donald Trump proposed to wife Melania in 2005 with an emerald-cut diamond from Graff Diamonds that weighed more than 10 carats.

At the time of their engagement, he told The New York Times he got a $1 million discount on the ring — however, according to Forbes' reporting in 2018, Trump paid the full price of $1.5 million.

Regardless, he upgraded Melania's ring in 2015 for their 10th wedding anniversary, selecting another Graff Diamonds piece that weighed 25 carats and cost $3 million.

In December 2017, tech heiress Alexa Dell got engaged to real-estate investor Harrison Refoua at the Four Seasons Resort Hualalai.

The Daily Mail estimated that the 12-carat diamond ring is valued between $2 million and $3 million.

Kobe Bryant upgraded his wife Vanessa Bryant's ring in 2003 to "an eight-carat, emerald-cut purple diamond worth $4 million," Brides reported.

Kobe and their daughter Gianna died in a helicopter crash in January 2020.

In October 2013, Kanye West (who now goes by Ye) proposed to Kim Kardashian with a 15-carat, cushion-cut diamond ring designed by Lorraine Schwartz that was estimated to cost upward of $3 million, per E! News.

And almost three years later, West surprised his wife with another Lorraine Schwartz ring, this time weighing 20 carats.

However, Kardashian was robbed of the ring just weeks later while on a trip to Paris in October 2016; lawyers and police officials estimated that it was worth about $4.5 million.

The couple finalized their divorce in 2022 after six years of marriage. They have four children.

Jennifer Lopez said "I do" to Marc Anthony in 2004 after he proposed with an 8.5-carat blue diamond ring by Harry Winston worth an estimated $4 million, according to E! News.

The pair welcomed twins in 2008 and were married for 10 years before divorcing.

When Prince Rainier III of Monaco proposed to Grace Kelly in 1955, he pulled out a 10.47-carat, emerald-cut diamond ring by Cartier then worth about $4 million.

The couple married the following year, and remained so until Kelly's death in 1982. They had three children.

Lopez was engaged to the former New York Yankee from 2019 to 2021.

At the time of their engagement, experts from James Allen estimated to BI that the emerald-cut diamond ring was 15 carats and worth at least $1 million, while gemologists at Rare Carat estimated the ring was 20 carats and worth around $4.5 million.

Paris Kassidokostas-Latsis proposed to Hilton in 2005 with a 24-carat canary diamond.

She stopped wearing the reported $4.7 million ring just four months after they initially announced their engagement.

Orlando Bloom proposed to Katy Perry in February 2019 with a floral-inspired engagement ring.

It was widely reported that the center stone is either a ruby or a pink diamond, while eight white diamonds flank it to resemble petals. Since the center stone composition has never been confirmed, experts' reported price estimates have ranged from $25,000 all the way to $5 million, The Knot reported.

The couple welcomed their daughter in August 2020, and despite their engagement happening nearly six years ago, they've never announced if they're officially married.

However, they've continued to support each other publicly at events, with Bloom presenting Perry with the MTV VMA Video Vanguard Award in September 2024.

Bennifer rekindled their romance in 2021 and got engaged in April 2022 with a three-stone ring featuring a rare light-green radiant-cut diamond as the center stone.

Lopez told Apple Music in 2023 that Affleck also had the words "not going anywhere" engraved on the band as a reference to his email signatures when they reconnected.

Unfortunately, the couple's second chance was too good to be true; Lopez filed for divorce in August 2024 after just two years of marriage, though she will keep the $5.6 million ring, People reported, citing their divorce settlement.

One of the world's most iconic musical duos said "I do" in 2008 at a secret wedding. Her engagement ring has an overwhelming 24-carat, emerald-cut flawless center diamond.

Jay-Z gave Beyoncé the center diamond set on a split shank band with micro-pavé diamonds in platinum. It reportedly cost $5 million.

Anna Kournikova and Enrique Iglesias were lowkey about their relationship until she went public with a large radiant-cut canary diamond.

The unique, yellow diamond is set in platinum and has two other diamonds on either side — but this may be her second engagement ring. The tennis pro was spotted with a huge 11-carat, pear-shaped pink diamond back in 2004 which was reportedly worth as much as $2.5 million dollars.

These days she has mostly been spotted with the yellow one, paired with an equally impressive wedding band, though the two have long maintained that they're not interested in getting married. They have three children.

When Elizabeth Taylor wed Richard Burton for the first time in 1964, she had said yes to an emerald Bulgari brooch, not a traditional engagement ring, Vogue reported.

However, four years into their marriage, Burton purchased the 33-carat Asscher-cut Krupp diamond for $305,000 — it sold for $8.8 million at a Christie's auction in 2011.

Mariah Carey and billionaire James Packer broke the record for most expensive celebrity engagement ring in 2016 with a whopping 35-carat, emerald-cut diamond.

The wedding was called off just months later, but luckily for the "Always Be My Baby" singer, she got to keep the $10 million ring since Packer was the one who broke it off, Us Weekly reported. She sold it in 2018 for just over $2 million, Page Six reported.