On February 9, the players, coaches and owners of either the Philadelphia Eagles or Kansas City Chiefs will win a coveted Super Bowl ring. The rings, which are understood to cost between $30,000 (£24,000) and $50,000 (£40,000), are widely considered to be one of the most iconic and beautiful awards in sport today. Few people are more familiar with the gleaming pieces of jewellery than New England Patriots owner Robert Kraft, who watched his iconic side win six Super Bowls. Yet, the multi-billionaire only has five rings, as Russian president Vladimir Putin has the other one. Kraft, 83, visited Russia...