Mystere 18ct White Gold 0.50 Carat Diamond Cluster Engagement Ring. The Mystere diamond collection is a small range of jewellery pieces, especially hand-selected for the woman who is as passionate about diamonds as we are.This gorgeous Mystere diamond engagement ring has a distinct vintage feel. Crafted in the beautiful lustre of 18ct white gold, the ring boasts a rectangular centrepiece of round brilliant diamonds framed by smaller stones to create a glorious centrepiece. Additional diamonds adorn the ring's shoulders providing all the sparkle a woman could desire. The perfect celebration of lasting love from the Mystere collection of diamond jewellery.