Nacozari Turquoise on Leather Cord No. 6This men's leather cord necklace features three large blue Nacozari turquoise beads. Two large sterling silver beads are between the turquoise stones and it's secured with sterling silver end caps and clasp. In your choice of length* and black or brown leather. Rare and one of a kind! The stones pictured is what you will receive. turquoise beads measures 12mm 14mm leather is 2mm thick . 925 sterling silver Standard Necklace Sizes for Men: 18" (45.