Natural African Turquoise(Jasper) Beads Strands, Rondelle, Size: about 6~6.5mm in diameter, 3~4mm thick, hole: 1mm; about 105pcs/strand, 15.7 inch(40cm).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.