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She began her career training as a goldsmith at Sir John Cass College before working as a rough diamond grader for De Beers. She then became a polished diamond dealer in Antwerp and then joined Philips the Auctioneers in London.

She moved on to Sotheby’s and was their senior jewellery specialist and auctioneer for fourteen years and since 2009 has worked independently. Joanna lectures and writes articles for publications worldwide and is a published author with her books, 'Collect Contemporary Jewelry', ‘Emerald’, ‘Ruby’, 'Sapphire' and a contributing author to ‘Graff’ and ‘Cartier Panthère.

She curates contemporary jewellery exhibitions and has recently launched her Online Fine Jewellery School. Joanna is a Fellow of the Gemmological Association, Fellow of Royal Society of Arts, a Liveryman and Court Assistant of the Worshipful Company of Goldsmiths.