The crossed arrows originates from the ancient native American. They symbolise the close ties of a firm and long-lasting friendship. Finished with five black spinel stones, this is the ideal piece to celebrate your ride of die. The Story Behind The Stone Said to repel negativity, black spinel is one of the rarest and most valuable gemstones. Its name originates from the Greek word "Spinos" which means sparkle or spark. This August birthstone will trigger empowerment and inspiration to its bearer.