Stone Type _________________ Peridot\ \ Approximate Stone Size _______ 10mm Round\ \ Approximate Stone Weight _____ 5 ct \ \ Jewelry Metal _______________ Solid. \ \ Peridot was believed by the Romans to help dreams become reality and drive away the evil spirits of the night as its brilliant color did not fade in lamplight but instead seemed to glow. \ \ The traditional brilliant cut round stone guarantees that you get to. Sterling Silver Pendant Peridot SP089.