15 September Day in the life A Day in the Life of a Jewellery and Gemstone Expert Witness 11. Report Writing, 15. Giving Oral Evidence, Valuation, Jewellery and Gemstone Dr Richard Taylor is an Expert in the identification, verification and valuation of diamonds, gemstones, jewellery, watches, silver and antiques. He tells us how got into Expert Witness work, what he loves about it, and why he likens being cross-examined to playing chess.