Several items such as a diamond and a sapphire ring were stolen from a property in Radnage.
Between 10.30am and 12.15pm on Wednesday, April 28, the culprits entered the house on Bennet End Road and took the belongings, which also included an MP3 Player and a briefcase.
It is not known if the briefcase was containing anything.
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Investigating officer P3484 Emily Sendall of the Investigation hub based at High Wycombe said: "We are appealing for anyone who may have witnessed the incident or who may have information to call our 24-hour enquiry centre on 101, quoting reference 43210180454.
“If you don’t want to speak directly to police you can contact the independent charity Crimestoppers anonymously on 0800 555 111.
“No personal details are taken, information is not traced or recorded and you will not go to court.”
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