Kate Middleton's sapphire engagement ring 'dupe' available from Marks and Spencer for £19.50

You can now buy an almost identical version of Kate Middleton's ring from Marks and Spencer [Image: Getty]

It is one of the most iconic engagement rings in the world - but you can now get your hands on an almost identical version of Kate Middleton's stunning piece of jewellery for a much more reasonable price.

The Duchess of Cambridge, 37, was given the sapphire piece, believed to be worth £300,000, by Prince William, 37, when he proposed in Kenya in October 2010.

Kate, then aged 28, debuted the ring - which previously belonged to Princess Diana - at their engagement announcement the following month.

The mum-of-three still regularly wears the piece, which features 14 solitaire diamonds and a setting consisting of 18-carat white gold.

Now, Marks and Spencer has unveiled a £19.50 ring which looks remarkably similar.

The realistic 'dupe' has a blue circular gem surrounded by faux diamonds and platinum plating.

Shoppers can purchase it in three sizes - small, medium and large.

The 'Platinum Plated Baguette Regal Ring' is available to order on the British chain's website.

It has already received a number of positive online reviews.

One person wrote: "Lovely looking ring, well made and it fits well."

Another commented: "Perfect for parties etc looks lovely and great quality."

A third shared: "This ring is lovely. Sparkles and is a wow when worn."

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Kate and William host regatta
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Kate and William host regatta
COWES, ENGLAND - AUGUST 09: Princess Charlotte of Cambridge and Catherine, Duchess of Cambridge having fun together after the inaugural King’s Cup regatta hosted by the Duke and Duchess of Cambridge ahead of Cowes SailGP on August 09, 2019 in Cowes, England. (Photo by Clive Mason/Getty Images)
COWES, ENGLAND - AUGUST 08: Princess Charlotte of Cambridge and Catherine, Duchess of Cambridge having fun together after the inaugural King’s Cup regatta hosted by the Duke and Duchess of Cambridge on August 08, 2019 in Cowes, England. Their Royal Highnesses hope that The King’s Cup will become an annual event bringing greater awareness to the wider benefits of sport, whilst also raising support and funds for Action on Addiction, Place2Be, the Anna Freud National Centre for Children and Families, The Royal Foundation, Child Bereavement UK, Centrepoint, London’s Air Ambulance Charity and Tusk. (Photo by Chris Jackson/Getty Images)
Catherine, Duchess of Cambridge with Princess Charlotte look through a window at the prize giving after the King's Cup Regatta in Cowes, the Isle of Wight, Britain August 8, 2019. Andrew Matthews/Pool via REUTERS
COWES, ENGLAND - AUGUST 08: Princess Charlotte of Cambridge and Catherine, Duchess of Cambridge having fun together after the inaugural King’s Cup regatta hosted by the Duke and Duchess of Cambridge on August 08, 2019 in Cowes, England. Their Royal Highnesses hope that The King’s Cup will become an annual event bringing greater awareness to the wider benefits of sport, whilst also raising support and funds for Action on Addiction, Place2Be, the Anna Freud National Centre for Children and Families, The Royal Foundation, Child Bereavement UK, Centrepoint, London’s Air Ambulance Charity and Tusk. (Photo by Chris Jackson/Getty Images)
COWES, ENGLAND - AUGUST 08: Prince George (L) with Princess Charlotte (C) at The Royal Yacht Squadron during the inaugural Kings Cup regatta hosted by the Duke and Duchess of Cambridge on August 08, 2019 in Cowes, England. Their Royal Highnesses hope that The Kings Cup will become an annual event bringing greater awareness to the wider benefits of sport, whilst also raising support and funds for Action on Addiction, Place2Be, the Anna Freud National Centre for Children and Families, The Royal Foundation, Child Bereavement UK, Centrepoint, Londonís Air Ambulance Charity and Tusk. on August 08, 2019 in Cowes, England. (Photo by Antony Jones/Getty Images)
COWES, ENGLAND - AUGUST 08: Princess Charlotte attends the King's Cup Regatta on August 08, 2019 in Cowes, England. (Photo by Karwai Tang/WireImage)
Prince George and Princess Charlotte look through a window at the prize giving after the King's Cup Regatta in Cowes, the Isle of Wight, Britain August 8, 2019. Andrew Matthews/Pool via REUTERS
COWES, ENGLAND - AUGUST 08: Princess Charlotte (C) at The Royal Yacht Squadron during the inaugural Kings Cup regatta hosted by the Duke and Duchess of Cambridge on August 08, 2019 in Cowes, England. Their Royal Highnesses hope that The Kings Cup will become an annual event bringing greater awareness to the wider benefits of sport, whilst also raising support and funds for Action on Addiction, Place2Be, the Anna Freud National Centre for Children and Families, The Royal Foundation, Child Bereavement UK, Centrepoint, Londonís Air Ambulance Charity and Tusk. on August 08, 2019 in Cowes, England. (Photo by Antony Jones/Getty Images)
The Duchess of Cambridge takes part in the King's Cup regatta at Cowes on the Isle of Wight. The royal couple are going head to head in the regatta in support of their charitable causes.
The Duke and Duchess of Cambridge take part in The King's Cup Regatta, Cowes, Isle of Wight. Photo credit should read: Doug Peters/EMPICS
Prince George attends the King's Cup regatta at Cowes on the Isle of Wight.
The Duchess of Cambridge takes part in the King's Cup regatta at Cowes on the Isle of Wight. The royal couple are going head to head in the regatta in support of their charitable causes.
The Duchess of Cambridge, Prince George and Princess Charlotte at The King's Cup Regatta, Cowes, Isle of Wight. Photo credit should read: Doug Peters/EMPICS
The Duchess of Cambridge takes part in the King's Cup regatta at Cowes on the Isle of Wight. The royal couple are going head to head in the regatta in support of their charitable causes.
The Duchess of Cambridge and Princess Charlotte at The King's Cup Regatta, Cowes, Isle of Wight. Photo credit should read: Doug Peters/EMPICS
The Duke and Duchess of Cambridge take part in The King's Cup Regatta, Cowes, Isle of Wight. Photo credit should read: Doug Peters/EMPICS
The Duchess of Cambridge (2nd right) takes part in the King's Cup regatta at Cowes on the Isle of Wight. The royal couple are going head to head in the regatta in support of their charitable causes.
The Duchess of Cambridge takes part in the King's Cup regatta at Cowes on the Isle of Wight. The royal couple are going head to head in the regatta in support of their charitable causes.
The King's Cup regatta at Cowes on the Isle of Wight.
The Duke of Cambridge takes part in the King's Cup regatta at Cowes on the Isle of Wight. The royal couple are going head to head in the regatta in support of their charitable causes.
The Duke of Cambridge takes part in the King's Cup regatta at Cowes on the Isle of Wight. The royal couple are going head to head in the regatta in support of their charitable causes.
The Duke of Cambridge takes part in the King's Cup regatta at Cowes on the Isle of Wight. The royal couple are going head to head in the regatta in support of their charitable causes.
The Duchess of Cambridge takes part in the King's Cup regatta at Cowes on the Isle of Wight. The royal couple are going head to head in the regatta in support of their charitable causes.
The Duchess of Cambridge takes part in the King's Cup regatta at Cowes on the Isle of Wight. The royal couple are going head to head in the regatta in support of their charitable causes.
The Duchess of Cambridge takes part in the King's Cup regatta at Cowes on the Isle of Wight. The Duke and Duchess of Cambridge are going head to head in the regatta in support of their charitable causes.
File photo dated 07/05/19 showing The Duke and Duchess of Cambridge unveiling the King's Cup Regatta trophy at the Cutty Sark, London.
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And a fourth added: "I'm really pleased with my purchase. The ring is beautiful and looks very authentic.

"I wore it to work the other day with a navy dress and got lots of compliments. Well done M&S! More like this please."

Following his proposal to Kate, the Duke of Cambridge revealed he chose the ring as a way of "making sure my mother didn't miss out on today and the excitement".

His mother's jewellery has been passed down to Meghan Markle too, with Prince Harry's wife the owner of his late mother's £75,000 aquamarine ring.

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Princess Diana
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Princess Diana
Diana and the Queen snapped in good spirits.
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana Resting Her Head In Her Hands Whilst Sitting On The Steps Of Her Home At Highgrove, Gloucestershire. (Photo by Tim Graham Photo Library via Getty Images)

The Princess of Wales rides in the passenger seat of a vintage Mercedes-Benz.

Princess Diana, Prince Harry, Prince William, Prince Charles at William's first day at Eton.
circa 1965: A young Lady Diana Spencer (1961 - 1997), later the wife of Prince Charles.
Prince Charles and his fiancee Lady Diana Spencer with Queen Elizabeth II at Buckingham Palace, 7th March 1981.
Prince Charles  and Lady Diana Spencer on their wedding day.
Prince Charles and Lady Diana Spencer on their wedding day.
Prince Charles, the Prince of Wales kissing his wife, Princess Diana (1961 - 1997), on the balcony of Buckingham Palace after their marriage.
Princess Diana on her wedding day.
(FILE PHOTO) The Prince and Princess of Wales leave St Paul's Cathedral after their wedding, 29th July 1981. She wears a wedding dress by David and Elizabeth Emmanuel and the Spencer family tiara.
A pregnant Princess of Wales joins the royal family on the balcony of Buckingham Palace for the Trooping of the Colour ceremony, June 1982. The Queen, Prince Philip, Princess Alexandra of Kent and Angus Ogilvy are among the group. 
(FILE PHOTO) The Princess of Wales attends a dinner held by President Ghulam Ishaq Khan in Islamabad during her official visit to Pakistan, September 1991.
Princess Diana pictured in a tiara.

Diana looks deep in thought on her wedding day.

Princess Diana smiles for the cameras.
Princess Diana in a stylish evening gown.
Princess Diana and Prince Philip at a polo match in Windsor on July 26th , 1987.
Prince Charles and Princess Diana leave St. Mary’s Hospital in London, with Prince Harry on September 16, 1984.
Princess Diana with her sons William and Harry in 1995.
Princess Diana pictured in a stylish beret.
Princess Diana is snapped in India.
Princess Diana doing charity work.
Princess Diana holding Harry as a baby.
Princess Diana meeting members of the public.
Princess Diana poses in a bikini during a holiday.
Diana beams as she sits with William and Harry.
Princess Diana pictured with young William.
Princess Diana is seen holding hands with her two young sons William and Harry.
Princess Diana with William and Harry.
Diana with her sons in December 1995.
Diana pictured with Charles.

An adorable Prince William and Prince Harry can be seen standing beside their mother, Princess Diana, as a little girl gives flowers to the Queen Mother in 1991.

Prince Charles, Prince of Wales, kissing Princess Diana, Princess of Wales, at a polo match.
Diana gets involved in a parents' day race.

Diana dazzles in a green frock.

Diana and Charles pictured at a glamorous evening event.
Diana and Charles pose for a formal picture.
Charles and Diana boarding a flight.
Charles and Diana as newlyweds.
Diana sporting a casual look.

Diana wears a tartan outfit to match Charles' kilt for a trip to Scotland.

A young Diana shows off sapphire sparkler.
Diana dazzles in white frock and tiara during trip to the Middle East.
Diana pictured with baby Harry.
Diana poses for pictures with members of the public during a walkabout.
Diana and Charles enjoy a family day out.
Diana pictured alongside a stern-faced Queen.
Diana pictured alongside Princess Anne.
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana Resting Her Head In Her Hands Whilst Sitting On The Steps Of Her Home At Highgrove, Gloucestershire. (Photo by Tim Graham Photo Library via Getty Images)
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