Nick Cannon has presented Mariah Carey a ring from the design board of Jacob & Co. The two celebrities are known to soon tie the knot. The ring is crafted from platinum and features a 10 carat square emerald cut fancy light pink diamond as the center stone surrounded by 58 intense pink diamonds and two half moon diamonds on each side. Cannon worked closely with Jacob Arabo to create the one-of-a-kind piece. The total carat weight of the ring is 17 carats with a value of $2.5 million. %% Jacob & Co. has been an old hand at creating fine jewellery and timepieces for celebrities like Brad Pitt, Sharon Stone, David Beckham and Madonna. Jacob & Co. has established a sterling reputation amongst leaders in the entertainment industries over the past 25 years.