Natural African Turquoise(Jasper) Beads Strands, Flat Round/DiscSize: about 4mm in diameter, 2mm thick, hole: 0.7mm; about 154pcs/strand, 15.43 inch (39.2cm).â African Turquoise is a jasper stone that is mined in Africa. This stone is called African Turquoise as it rich blue-green color and has the similar matrix pattern. African turquoise is actually a much harder stone than traditional turquoise, which makes it great for beaded bracelets that may get abused in day-to-day wear.