Showbiz
Rex Features
The BBC Breakfast presenter reportedly spent hours looking at rings in Hatton Garden in central London and then in New Bond Street.
Silverton, 38, met Heron on a course for BBC journalists going to trouble zones, reports the Daily Mail.
After separating for a brief period, the couple reunited in January. A friend said: "They both have to travel a lot and have split up before but they have never stopped knowing how they feel about each other."
Silverton earlier revealed that a man she was dating had come back into her life. "He has just returned from working in Afghanistan. So if this is my year for settling down, it would be nice," she said.
More: Kate Silverton, Showbiz
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