Mason & Madison Co. Has Been Featured On. As the world’s brilliant jewelry, this incredible MASON New York Jewelry is full of fire and perfect for those who want the high quality, responsibly sourced jewelry at an accessible price.. Designed by Mason & Madison Co. x MASON New York. Item Details:. • 1 Carat Diamond Key Pendant Necklace. • 1 Carat Round Diamond Chain Bracelet. • Lab-grown Diamonds. • Diamond Clarity Rating Code: VVS1. • Diamond Color Rating Code: D. • Diamond Cut Grade: Excellent. • Chain length: 16 in, Extension length: 2 in. • Bracelet length: 9 in. • Diamond Brilliant Benefits: the Energy of POISE + PURITY + VISION. • Dispatched from New York, USA