Louise Butterworth Jewellery valuations for Insurance, Probate or Family Division. Quick turnaround, very competitive fees, all valuations carried out on the premises, your precious items are not sent to a third party. Louise Butterworth is a Fellow of the Gemmological Association of Great Britain Diamond Graduate of the Gemmological Association of Great Britain Fellow of the National Association of Goldsmiths. Institute of Registered Valuers. Member of the Society of Jewellery Historians. and a past recipient of the prestigious David Wilkins Award.