Some high-profile couplings last, some don't, but diamonds? Those last forever.
Take Iggy Azalea's new bling, for instance. Los Angeles Lakers star Nick Young proposed to Iggy with a stunning custom-cut 10-carat diamond ring valued at $500,000.
In honor of the Australian rapper's engagement, we've ranked the spectacular rocks that have graced some of Hollywood's most famous hands from smallest to largest for your ogling pleasure.
.75-carat - Jessa Duggar
The 19 Kids and Counting star received a modest .75-carat diamond ring from Ben Seewald in September 2014, and the two tied the knot less than three months later.
1-carat - Michelle Obama
President Barack Obama proposed to the First Lady with a beautiful round-cut diamond ring -- estimated to be 1-carat -- over a romantic candlelit dinner. The couple have since been married for over 20 years.
2-carat - Keira Knightly
In spring of 2012, rocker James Righton gave the actress a 2-carat brilliant-cut solitaire diamond ring, which holds an estimated price tag of $40,000. The following May, the pair said their "I Do's" during a low-key ceremony in France.
3.02-carat - Nicole "Snooki" Polizzi
The Jersey Shore stars got engaged in early 2012 when Jionni LaValle proposed to Snooki with a 3.02-carat princess-cut diamond ring. Reportedly valued at $55,000, the ring includes a custom-built band adorned with 2-carats of diamonds. The pair later got married during a Great Gatsby-themed ceremony in New Jersey that aired on the final episode of Snooki & JWOWW.
3.5-carat - Miley Cyrus
In 2012, Liam Hemsworth asked his Last Song co-star to marry him with a 3.5-carat cushion-cut diamond ring created by Neil Lane. The two later broke off their engagement, and Miley has reportedly since lost the ring, which is valued at over $100,000.
4-carat - Reese Witherspoon
The Academy Award-winning actress received a gorgeous 4-carat Ashoka-cut diamond ring set on a pavé diamond-and-platinum band from Hollywood agent Jim Toth in late 2010. The couple recently celebrated their fourth wedding anniversary.
4.5-carat - Jennifer Garner
The actress married Ben Affleck in 2005, after he proposed to her with a 4.5-carat cushion-cut diamond. The couple, parents to daughters Violet and Seraphina and son Samuel, have been battling breakup rumors as of late, just as their 10th anniversary approaches later this month.
5-carat - Mila Kunis
After nearly two years of dating, Ashton Kutcher proposed to his former That '70s Show co-star with a minimalist-style engagement ring -- but there's nothing minimal about that diamond! Estimated to be 5 carats, the ring is likely worth upwards of $260,000. The two haven’t officially admitted to being married yet, but Mila's ring finger tells another story.
6-carat - Lady Gaga
Earlier this year, Taylor Kinney proposed to the pop star with a massive heart-shaped diamond designed by Lorraine Schwartz. Shortly after the engagement, Lady Gaga posted a photo of the ring, estimated at 6-carats, on Instagram captioned, "He gave me his heart on Valentine's Day, and I said YES!"
7-carat - Blake Lively
Ryan Reynolds gave the Age of Adaline actress a beautiful 7-carat pink oval diamond set in rose gold. The $2 million ring received a matching band when Blake and Ryan exchanged vows in the fall of 2012.
8-carat - Jennifer Aniston
Actor Justin Theroux popped the question back in August 2012 with an estimated 8-carat radiant-cut diamond, but the actors have yet to officially tie the knot.
8.5-carat - Jennifer Lopez
Marc Anthony proposed to the platinum-selling artist with an 8.5-carat blue diamond ring, which is reportedly worth $4 million -- quite a step up from the 6.1-carat pink Harry Winston diamond that Ben Affleck gave J.Lo in 2002. The singers separated in 2011 and officially divorced three years later.
14-carat - Avril Lavigne
Back in August 2012, Nickelback frontman Chad Kroeger popped the question to Avril with a 14-carat pear-shaped diamond ring. The Canadian crooners married a year later in the south of France. For their one-year anniversary, Chad reportedly gifted his wife with another diamond ring -- a 17-carat emerald cut!
15-carat - Kim Kardashian
Kanye West proposed to the stylish reality star in front of family and friends with a flawless 15-carat cushion-cut diamond ring, estimated to be worth more than the 20-carat ring Kim received from Kris Humphries in 2011. Kimye later exchanged vows in Florence, Italy, and the high-profile pair recently celebrated their first anniversary of marriage.
16-carat - Angelina Jolie
After dating for seven years, Brad Pitt proposed to Angelina with a unique 16-carat table-cut sparkler, which has an estimated value of $500,000. The duo later held their wedding ceremony at Chateau Miraval in France.
17-carat - Mariah Carey
The "Infinity" singer received a $2.5 million Jacob & Co. engagement ring from Nick Cannon in 2008, and the famous duo were married mere weeks after becoming engaged. Flanked by 58 pink diamonds, the 17-carat emerald-cut pink center diamond boasts two half-moon gems on each side. Six years later, the couple separated, and they're currently going through a very public split.
18-carat - Beyoncé
The music mogul popped the question to the Grammy Award-winning songstress with a Lorraine Schwartz-designed 18-carat sparkler valued at over $5 million. The power couple later exchanged vows during an intimate New York City ceremony in April 2008 and now have a three-year-old daughter, Blue Ivy.
18-carat - Kate Middleton
Originally purchased for Princess Diana in 1981, Kate Middleton's engagement ring is now worth $500,000 and features a 12-carat sapphire surrounded by 14 diamonds -- perfectly fit for a princess! Proud parents to 22-month-old Prince George and newborn Princess Charlotte, Kate and Prince William recently celebrated their fourth wedding anniversary.
24-carat - Paris Hilton
In 2005, Paris Hilton received a massive 24-carat canary diamond ring from Greek shipping heir and socialite Paris Latsis. The rock was valued at $4.7 million, but money doesn't buy love -- the same-named couple called off their wedding four months later.
Bonus: Victoria Beckham
When David Beckham first proposed to the former Spice Girl in 1998, he did so with a modest (by celebrity standards) 3-carat marquise-cut diamond on a yellow band. Since then, Victoria has upgraded to a collection of 13 engagement rings from the soccer star, including a pear-shaped diamond that is estimated to be between 15- and 17-carats.