Frank & co. X Monica Ivena Love Poetry Fidelis Promise Ring Rings and loyalty, will last a lifetime. That promise is taking a luxurious shape of Frank & co. and Monica Ivena Fidelis Promise Ring. Crafted with excellent craftsmanship with 4 grams of 18k gold. Adorned with 36 pcs F VVS diamonds in stunning formation surrounding the oval cut Pink Sapphire. The everlasting shine of diamonds symbolizes the lifetime promise, with the breathtaking sparkle of Pink Sapphire adding a whimsical twist to the love journey.