An Antiques Roadshow participant was taken aback by a strict rule on set, and the valuations of her items also left her surprised. The moment occurred during the filming of the American version of the popular BBC programme.

Journalist Jennifer Kopf had the opportunity to participate in the forthcoming series filmed at Grant's Farm in St. Louis. The Country Living writer brought along a framed silhouette and blue glass lamps, keen to learn their value.

She explained that depending on the category of your item, you end up consulting with an expert appraiser from that field in a designated area 'spread out all across the grounds'.

To prevent any spoilers from leaking, she disclosed that there was one rule she had to adhere to while on set.

Jennifer penned for the magazine: "Set up in between were three different filming 'studios' with those famous tables arranged for the big-time appraisals."

Undated BBC handout photo of Fiona Bruce with the Antiques Roadshow logo. Issue date: Sunday February 11, 2024
An Antiques Roadshow guest revealed that they were completely caught off guard by a strict rule

I wasn't allowed to tape anything happening on set so as not to take away anything from the big reveals come air time. "Unfortunately, her items didn't fetch the price she had hoped for, with her framed silhouette fetching a modest $25 to $50.However, what really stung was the disappointing valuation of the lamps. Jennifer admitted: "$15 a piece.

I have to admit, this hurt a little. But I still love my lamps and will find a perfect spot for them soon".

Antiques Roadshow
Antiques Roadshow guest shocked after item was a rare and valuable emerald piece

This follows another Antiques Roadshow episode where a guest was left astounded after a family ring, long assumed to be inexpensive costume jewellery, turned out to be rare and valuable.

An emerald piece has fetched a price far beyond its anticipated value. The astonishing discovery was made during an episode first aired in October 2022 and rebroadcast on Sunday, 15 June.

Expert John Benjamin left one family utterly gobsmacked. The guests, two cousins, brought along a trove of inherited heirlooms passed down through the generations.

Among the items were a gold novelty pencil, a decorative brooch featuring a fly on a flower, and the green stone ring that became the focus of attention. Discussing the provenance of the pieces, the guests disclosed that many belonged to their great-great-great grandmother, born in 1858.

One item, a pencil shaped like a mountaineer's ice pick, bore the names of French mountains. The most startling revelation concerned the green stone ring, which the family had always believed to be costume jewellery.

Benjamin valued the ring at a staggering £4,000. In total, the collection was estimated to fetch around £7,000 at auction.

Antiques Roadshow can be viewed on BBC One and iPlayer.