Natural African Turquoise(Jasper) Beads Strands, RoundSize: about 10~10.5mm in diameter, hole: 1mm; about 37pcs/strand, 15.5 inch.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.