One of the best-known Canadian gemstone localities is the Jeffrey (Asbestos) Mine in Val-des-Sources, Quebec.  Although asbestos production began here in 1881, mineral collectors have only known about the presence of fine crystals since about 1950.  Grossular garnet in a variety of colours (orange, green, pink, colourless) and other fine crystals, such as vesuvianite and diopside, have been collected at the Jeffrey Mine over the decades since then.

Vesuvianite crystals and gemstones from the Jeffrey Mine are most commonly yellow-green, while vibrant magenta and chrome green colours are rare. Clean gems are rare in sizes above about one carat.  The vesuvianite offered for sale on this page comes from the Jeffrey Mine.