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Designed by Lorraine Schwartz, Blake's 12-carat oval shape ring with rose-gold accents from Ryan Reynolds has an estimated value of $2 million. The sparkler is still one of the most requested celebrity styles from brides-to-be.

Princess Diana's engagement ring is widely known as one of the most famous rings in the world, and for good reason. The timeless piece from the official royal jeweler Garrard features a 12-carat sapphire surrounded by 14 diamonds and set in 18-karat white gold. The ring was later passed on to Kate Middleton, when Prince William proposed in 2010.

Princess Diana actually figures prominently into both of her son's ring choices. The approximately $50,000 12-carat sapphire and diamond ring Prince William gave to Kate Middleton was his late mother's engagement ring from Prince Charles.

Designed by Hollywood favorite Lorraine Schwartz, Beyoncé's engagement ring is a 24-carat, emerald-cut diamond ring with a split band, estimating to be worth $5 million. Here, she's seen sporting the stunning rock at the 2009 Oscars, complemented by a black and gold mermaid-style gown by House of Deréon.

Britney Spears's beautiful diamond engagement ring features a 4-carat round stone in a platinum cathedral setting. To make things even more romantic, fiancé Sam Asghari had his nickname for Britney, "Lioness," engraved on the inside of the ring.

Designed by Canadian company Paris Jewellers, Kaitlyn Bristowe's giant engagement ring is everything she wanted. The former Bachelorette's oval-shaped ring is 5.09 carats and inspired by her dresses, as her fellow Bachelor fiancé Jason Tartick described.

Gwen Stefani's engagement ring from Blake Shelton is a stunning, square-shaped diamond set on a gold band with two smaller diamonds to accent the center stone. The "Hollaback Girl" singer's ring is estimated to be $800,000.

Designed by James de Givenchy of Taffin Jewelry, Scarlett's engagement ring is a massive rock weighing 11 carats. With a yellow diamond and dark band, the ring is a stunning, yet unconventional take on the traditional symbol of engagement.

Designed by Seoul-based jewelry shop Diligems owner Yueun Esther Shin, HyunA and Dawn's matching engagement rings feature a center opal surrounded by pink, green, and silver stones set in a white gold band. The one-of-a-kind pieces took over a month to dream up and conjure images of the chunky baubles popular in the early 2000s.

Megan Fox's engagement ring features her emerald birthstone, as well as her fiancé Machine Gun Kelly's birthstone, a diamond. Based on the ultimate love story, MGK designed the ring special for the occasion, "i know tradition is one ring, but i designed it with Stephen Webster to be two: the emerald (her birth stone) and diamond (my birth stone) set on two magnetic bands of thorns that draw together as two halves of the same soul forming the obscure heart that is our love," he wrote on Instagram.

George Clooney gave wife Amal a 7-carat ethically sourced diamond ring when they got engaged in April 2014. The ring has a baguette on each side of the large center stone and costs around $600,000 to $750,000.

Jessica Biel got engaged to Justin Timberlake over the holidays in 2011. He popped the question with a square-cut diamond, complete with subtle aquamarine accents (Jessica's birthstone), reportedly worth $130,000.

Ciara and Seattle Seahawks star Russell Wilson got engaged in the Seychelles in March 2016. The songstress received a massive 16-carat diamond to seal the deal.

Parker has been married to Matthew Broderick since 1997 — a lifetime by Hollywood standards. But before she said "I do," Parker said yes to a 7- to 8-carat, emerald-cut diamond on a yellow gold band. SJP's ring is reportedly worth $400,000 to $600,000.

Prince Rainier III of Monaco originally proposed to Grace Kelly with a Cartier eternity band of rubies and diamonds — until he saw other Hollywood leading ladies sporting flashier sparklers. The royal then presented his bride-to-be with a second Cartier style: a 10.5-carat emerald-cut diamond flanked by two baguettes.

John Krasinski popped the question to Emily in August 2009. Her Neil Lane vintage-inspired stunner features a three-carat Edwardian diamond set in platinum and is worth around $100,000.

Richie's ring from Joel Madden is a 4-carat stunner with a halo setting designed by the couple in collaboration with celebrity jeweler Neil Lane. The platinum style is estimated at a value of $200,000.

Pippa Middleton's engagement ring is a large Asscher-cut diamond surrounded by a cluster of diamonds that is three carats and reportedly worth $200,000.

The "Gilmore Girls" alum accepted an octagonal-shaped diamond engagement ring in a scrollwork setting from "Mad Men" star Vincent Kartheiser in 2013. The rock is set on a platinum band and estimated to be worth $80,000.

Gabrielle Union's stunning engagement ring from basketball star Dwyane Wade is an 8.5 carat cushion cut diamond ring designed by jeweler Jason of Beverly Hills. The rock is estimated to be worth $1 million.

Will Smith popped the question to Jada in 1997 and dropped a quarter-million dollars to snag her this stunning stone. The 12-carat emerald-cut diamond ring features two shoulder-set baguette diamonds on either side.

Hailey Bieber's one-of-a-kind piece from Solow & Co. was designed by Justin Bieber before he popped the question while they were vacationing in the Bahamas in 2018. After the two were married in 2019, Hailey styled her diamond engagement ring with two wedding bands.

Spanish actor Javier Bardem proposed to Penélope Cruz with a vintage three-carat sapphire ring in 2009. It's estimated to be worth over $30,000.

Nikki Reed's engagement ring from Ian Somerhalder is a round diamond surrounded by 10 smaller diamonds in the shape of a flower, reportedly worth $75,000.

The "Legally Blonde" star's engagement ring from Jim Toth is a 4-carat Ashoka-cut diamond, reportedly worth approximately $160,000 to $200,000.