The famous jewels of the Kanchanaburi Sapphire and spinel are can be purchased at a. Wells gem. If you want a blue gem beads direct from the mines. Want to s p mines limited blue gem consisting of a coat, buy jewellery and Crafts Center. Along Highway No. 3086 (LAT ya-nongprue) and Wang Kaew jewelry factory at District, Tha makham. or at the bridge over the River Kwai.