Jewellery expert Alistir Tait is best known for his love of pricey rocks, but he also knows a thing or two about gems in the classic motoring world. The Scottish gold, silver and gem expert owns a highly-collectible 1989 Porsche 911 Carrera 4, which he uses as the perfect vehicle to tell the world about his love of gemmology. As well having a distinctive registration plate, G15 GEM, Alistir has also described the classic car’s deep burgundy colour in typical gemmological terms – Burmese ruby red.