Prince Harry popped the question to Meghan Markle after dating for 16 months. The ring was designed by Cleave and Company and the estimated price is set at $150,000.

In December 1999, actor Michael Douglas proposed to actress Catherine Zeta-Jones with an estimated 1-million-dollar antique ring from Fred Leighton.

Out of her eight marriages, Elizabeth Taylor's engagement ring from her third marriage to Mike Todd is the most iconic. Today, its price is estimated at $6 million.

Jacqueline Kennedy was gifted this 2.84-carat emerald and diamond ring on June 24, 1953, at a restaurant in Boston. The ring's estimated value is set at $1.39 million.

Beyoncé's emerald-cut diamond ring was created by popular jeweler Lorraine Schwartz and is believed to be worth $5 million.

During her brief engagement to Paris Latsis, socialite Paris Hilton wore a 24-carat emerald-cut diamond ring which was believed to cost $4.7 million.

Mia Farrow's 9-carat pear-shaped ring was worth $85,000 when she received it back in 1966. Today, the ring would be worth about $1,880,000.

Jeweler Lorraine Schwartz designed this $4 million 15-carat cushion-cut diamond ring, which was gifted to Kim Kardashian by Kanye West.

Billionaire James Packer proposed to Mariah Carey with a 35-carat diamond and platinum ring. It is estimated to be worth between $6 and $8 million.

Marilyn Monroe's baguette eternity band, which she received from her short-lived marriage to Joe DiMaggio, was sold at an auction in 1999 for $772,500.

Len Wiseman proposed to Kate Beckinsale with an estimated $1.4 million emerald-cut diamond set horizontally on a band of micro-pavé diamonds.

Chris Martin proposed to his now ex-wife Gwyneth Paltrow with an estimated $90,000 Asscher-cut diamond on a double-pavé band.

In 1947, Prince Philip proposed to Princess Elizabeth with a solitaire diamond set in platinum. It is estimated to be worth about $133,200.

English singer Seal presented his now ex-wife Heidi Klum with a canary yellow center diamond set in a gold band of pavé diamonds. It has an estimated value of $150,000.

Gabrielle Union received an estimated $1,000,000 ring from Dwyane Wade. The ring is an 8.5-carat cushion-cut diamond from Jason of Beverly Hills.

James Matthews proposed to Pippa Middleton in July 2016 with an estimated $200,000 large Asscher-cut diamond ring.

Blake Lively was gifted this oval-cut diamond with a micro-pavé brand by actor Ryan Reynolds. The ring is believed to be worth $2 million.

King Edward of England proposed to the Duchess of Windsor on October 27, 1936. Inscribed on the ring is "We are ours now." The ring was sold at 1987 for $1.98 million.

Justin Theroux popped the question to Jennifer Aniston in August 2012 using an estimated $500,000, 8-carat radiant cut diamond with a yellow gold band.

Actress Scarlett Johansson received an estimated $2 million vintage art deco ring from her then-fiancé Ryan Reynolds.

Prince Rainier proposed to Grace Kelly with an elegant 10.47 Cartier emerald-cut ring, which today would cost $4.06 million.

George Clooney proposed to Amal Clooney with an emerald-cut 7-carat diamond with two tapered baguettes. It is believed to be worth around $750,000.

The blue sapphire and diamond halo ring cost $40,000 when Prince Charles proposed to Princess Diana. Now in Kate Middleton's possession, it costs nearly $400,000.

Angelina Jolie's sparkling emerald-cut diamond with two tapered baguettes is priced at approximately $1.6 million.

Matt Bellamy proposed to Kate Hudson in April 2011 with a classic emerald-cut diamond with tapered baguettes. Its estimated value is $200,000.

In December 2014, Sofía Vergara received a cushion-cut diamond with micro-pavé halo, set at an estimated price of $500,000.

The first Lady of the United States received a 12-carat emerald-cut diamond graff that is believed to be worth $1,000,000.

Anne Hathaway's husband Adam Shulman proposed to her with a 6-carat emerald-cut diamond that has an estimated price of $150,000.

Lady Gaga and Taylor Kinney got engaged on Valentine's Day in Manhattan. The singer-songwriter received a $600,000, 6-carat heart-shaped diamond.

Designed by jeweler Jamie Wolf, Natalie Portman's engagement ring from Benjamin Millepied is an estimated $200,000 conflict-free diamond set in recycled platinum.

Jennifer Lopez's 8.5-carat blue diamond ring from Mark Anthony has an estimated worth of $1,200,000 to $2,500,000.

Olivier Sarkozy proposed to Mary-Kate Olsen in February 2014 with an antique Cartier ring. The ring has an estimated price of $81,000.

Reese Witherspoon received a 4-carat Ashoka-cut diamond from her husband Jim Toth. The estimated worth of the ring is $450,000.

Miranda Kerr began dating her billionaire soon-to-be husband in 2015. By July the next year, he proposed to her with a ring that cost between $75,000 and $100,000.

Jacqueline Kennedy Onassis' 40.00-carat Marquise Lesotho III Diamond was estimated between $500,000 and $600,000, but was sold for $2,600,000.

Drew Barrymore received an estimated $80,000 4-carat radiant-cut diamond from her now ex-husband Will Kopelman.