Size 6. Fading see picture. The fear of the number 13 is called Triskaidekaphobia. It is believed that 10% of the United States has a fear of the number. Some cultures, including Ancient Egyptians, actually consider 13 to be a very lucky number. What do you believe? Bring yourself some extra luck in this cut out signet ring .925 Sterling Silver Gold Plated in 18K Yellow Gold