10 of the biggest and most expensive A-list engagement rings: from Gwen Stefani to Kate Middleton

From the Duchess of Cambridge's heirloom sapphire to Mariah Carey's $10 million sparkler, we say 'I do' to some of the biggest rings that have graced celebrity fingers

Kim Kardashian, Anna Kournikova and Mariah Carey have all been the recipients of very expensive engagement rings.

Fans have been trying to get a glimpse of Hollaback Girl star Gwen Stefani's impressive engagement ring for weeks, ever since country singer Blake Shelton popped the question. And this week, the No Doubt frontwoman, 51, obliged, flashing the sparkler in an Instagram story.

Here, we take a look at some of the most impressive and expensive celebrity engagement rings ...

1. Gwen Stefani

Country star Blake Shelton proposed to his fellow 'The Voice' judge Gwen Stefani in October. Instagram

Saying 'I do' to country star Shelton in October, the Rich Girl singer has been coy about flashing her diamond. However eagle-eyed, fans caught a glimpse of the rock during one of Stefani's Instagram stories, and it's a big one.

It's estimated to be worth about $500,000 by Ajay Anand, the founder of diamond search engine Rare Carat, who told Insider: "We're looking at a gorgeous eight-carat, radiant-shape diamond with trapezoid sides … We're talking $500,000 in all."

2. Demi Lovato

Actor Max Ehrich popped the question to Demi Lovato after one month of dating, presenting her with a $1 million diamond. Instagram

Although her two-month engagement to actor Max Ehrich has now been very publicly called off, for a short while, the singer was sporting one of the most impressive diamonds in Hollywood. Under the Dome star Ehrich popped the question with a $1 million ring that E! News reported was partly "made from a diamond that was hers, part of it was his".

In July, when the couple got engaged, jeweller Mehul Pethani, from Cara Jewellers in Dubai, estimated that the large diamond is seven to eight carats, telling The National that the ring "would [have] cost Dh500,000 to Dh700,000" to buy in the UAE, "depending on the quality of diamonds".

3. Mariah Carey

Mariah Carey was given a $10 million ring by her Australian businessman fiance James Packer, although the pair split after a year-long engagement. Getty Images

The multi-million-selling singer shocked fans when she announced her engagement to billionaire Australian businessman James Packer back in 2016. Packer popped the question with a $10 million diamond ring, but the engagement fizzled within a year, with the mogul saying: "It was a mistake for her and a mistake for me."

4. Ciara

Estimated to be worth between $2 to $2.5 million, the American singer's engagement ring is a flawless 16-carat diamond. Given to her by her NFL star husband Russell Wilson, the centre diamond features trapezoid and pear-shaped diamonds on either side.

5. Catherine, Duchess of Cambridge

Catherine, Duchess of Cambridge's sapphire ring was famously chosen by Princess Diana as her engagement ring to Prince Charles. Getty Images

One of the most famous engagement rings in the world, the 18-carat sapphire once belonged to the late Diana, Princess of Wales. Set in white gold, the main stone is surrounded by 14 solitaire-cut diamonds.

6. Anna Kournikova

Former tennis player Anna Kournikova has two engagement rings from singer Enrique Iglesias. WireImage

The former tennis player features two engagement rings from her singer fiance, Enrique Iglesias. And her favourite appears to be the pear-shaped, 11-carat pink diamond, which is worth about $2.5 million.

7. Avril Lavigne

Canadian singer Avril Lavigne received a 14-carat diamond ring from Nickelback's Chad Kroeger when he proposed after one month of dating. FilmMagic

Nickelback's Chad Kroeger popped the question to the Skater Boi singer after only one month of dating back in 2012, with their marriage lasting two years. But the ring the How You Remind Me singer gave his temporary beloved was an incredible 14-carat pear-cut diamond, which he followed up by giving her a 17-carat diamond on their first anniversary.

8. Kim Kardashian

Kim Kardashian gave her $2.6 million ring back to her second husband Kris Humphries following their 72-day marriage. Shutterstock

For the second of her three engagements, Kardashian was presented with a 16.2-carat ring by basketball player Kris Humphries. Worth about $2.6 million, the reality TV star gave it back to Humphries after their 72-day marriage came to an end.

9. Hailey Baldwin Bieber

Justin Bieber popped the question to the model with an oval-shaped diamond said to be in the region of $500,000. With Bieber getting down on one knee in the Bahamas in 2018, Baldwin told Vogue of the proposal: "We were alone in a house, just the two of us. It was very special."

10. Amal Clooney

George Clooney proposed to Amal Alamuddin with a seven-carat, ethically mined diamond. Getty Images

Hollywood star George Clooney is estimated to have forked out about $750,000 for the ring he gave to human rights lawyer, Amal. The seven-carat, emerald-cut diamond was ethically mined and set in platinum.

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