By Joel Leaver A guest on Antiques Roadshow was left surprised by the apparent valuation of a custom-made item that she had showcased, with her even appearing to question the estimate. Sunday night’s episode of the BBC show brought host Fiona Bruce and the team back to Alexandra Gardens in Cardiff, after having been at the venue previously. Various antiques were introduced to the specialists at the location in Wales. At one point in the latest episode, fine jewellery specialist Joanna Hardy – who’s worked on the show since 2007 – got the chance to inspect a ring that contained both tanzanite a…