Andy Murray's fiancee Kim Sears debuted her huge engagement ring as she went low key during a coffee run in Surrey, England.

The 27-year-old artist was juggling groceries and two cups of coffee and showed off her huge diamond ring that is said to be worth £200,000, said MailOnline.

"Experts said Murray, who has an estimated fortune of £30million and earned £11.5million this year alone, had picked out a 'perfect statement ring' for Miss Sears, 27, who has been a constant courtside presence during his career," the publication said.

Vashi Dominguez, a diamond expert, told the British tabloid that the five-carat stone can easily be value at £200,000 as he explained: "Stepping away from the traditional shapes such as the round solitaire and emerald cut diamond, the couple are clearly choosing a lane of their own with a very loud and bold statement piece."

The tennis ace is reportedly worth £30 million.

According to People magazine, Andy Murray proposed to fiancee Kim Sears, which was confirmed by the tennis star's management company.

The couple has been dating since 2005 when they met at the US Open. She is the daughter of Nigel Sears, the former head of Law Tennis Association for women. Afterwards, Kim Sears has become a staple in his tennis matches as his loyal girlfriend can be seen cheering from the stands.

In 2006, Kim Sears, who was then 18 years old, attended Andy Murray's matches against Andy Roddick and Lleyton Hewitt in San Jose, California, which he won.

Later, he told The Telegraph, "It's the first time Kim has come to a tournament. That made me quite relaxed. I'll have to take her to some more tournaments."

The BBC News reported that Andy Murray and fiancee Kim Sears are mum on their engagement. "She was once described by future mother-in-law Judy Murray as 'the best thing to happen to Andy,'" the news agency added.