A 3-carat diamond ring remains sizable but manageable to wear for daily life. Its size is substantial, but still a modest size that doesn’t get in the way of most activities.
That said, these diamonds are in celebrities’ engagement rings, and they are still within the high-end and high-quality levels.
1. Katherine Heigl
Actress Katherine Heigl and singer-songwriter Josh Kelley’s engagement in June 2006 centered around this gorgeous, 3-carat pear-shaped diamond, en-haloed with smaller round diamonds, and set on a pave three-band platinum ring. It includes her mom’s original ring in the platinum band, making it extra meaningful.
Jewelry specialists place the value of this ring at $65,000, although it’s priceless due to including her mom’s original ring fused into it.
The couple married in 2007 with a winter wonderland wedding at Stein Eriksen Lodge in Utah.
2. Lily Collins
Actress Lily Collins announced her engagement to director and writer Chris McDowell in September 2020. He proposed to her in New Mexico with this unique and beautiful ring that features a 3-carat, bezel-set rose-cut diamond on an 18-carat yellow gold band, designed by Irene Neuwirth.
The couple wed on September 4, 2021. Industry insiders professionally estimated its worth at $100,000.
A burglar stole this ring, her wedding ring, and other possessions on May 6, 2023, from her locker at Edition Hotel in West Hollywood, while she was in the spa.
On March 6, 2026, Hakimian Imports Chicago Jewelers found it and returned it to her, reuniting with the precious ring after 3 years.
3. Kristine Dunst
Actress Kirsten Dunst and husband, actor Jesse Plemons, mirrored their married roles on Fargo when the couple announced their engagement in January 2017.
She debuted her engagement ring in the same month at Paris Fashion Week, which features a 3-carat, oval-cut diamond with a 4-prong setting and a pavé gold band. Jewelry specialists estimate its worth to be more than $100,000.
Kirsten and Jesse married in July 2022 with a private event at the GoldenEye resort owned by James Bond author Ian Fleming, in Ocho Rios, Jamaica.
4. Princess Beatrice
Princess Beatrice and Italian property developer Edoardo Mapelli Mozzi’s engagement in Italy in September 2019 debuted her Art Deco-inspired engagement ring. It features a 3.5-carat round diamond, with tapered baguette diamonds and 5 smaller diamonds on each shank on both sides, on a platinum band.
Jewelry specialists place the value of Princess Beatrice’s ring at more than $130,000.
The British Royal couple started dating in September 2018. They later wed in grand royal fashion on July 17, 2020.
5. Emily Blunt
British actress Emily Blunt’s engagement ring from hubby John Krasinski in August 2009 is a custom-designed ring from Neil Lane. It features a 3-carat, antique-round-cut with a 4-prong setting with diamond baguettes on each side on a platinum band.
This vintage design piece is worth $100,000, according to jewelry specialists.
The couple began dating in November 2008 after a mutual friend introduced them to each other. They tied the knot in Como, Italy, in July 2010.
6. Millie Bobby Brown
Actor and model Jake Bongiovi, glam rock icon Jon Bon Jovi’s son, proposed to Stranger Things actress Millie Bobby Brown in April 2023. He did so with a beautiful engagement ring that features a 3-carat, cushion-cut diamond with a halo of small diamonds on a pavé 18k gold band from his mom, underwater!
Industry experts estimate its price at $300,000.
Millie and Jake got married on May 24, 2024.
7. Emmy Rossum
Sam Esmail and Emmy Rossum’s engagement was in August 2015, with a beautiful 3-carat round-cut diamond with baguette side diamonds on a platinum band. Industry experts value the ring at $50,000.
The couple wed on May 29, 2017, at the Central Synagogue venue in New York City after two years of dating.
8. Scarlett Johansson
Actress Scarlett Johansson and Ryan Reynolds may no longer be together, but in their 2008 engagement, Ryan proposed to her with a beautiful ring. It featured a 3-carat, round-cut diamond set on a yellow gold band.
Industry specialists estimate its price at $300,000.
The couple were together from 2008 to 2011. Scarlett and Ryan separated in December 2010 and finally divorced in July 2011.
