Designer Engagement Rings from DemarcoJewelry.com Available in White or Yellow Gold 18KT and Platinum. 0.42 RDCapture her grace and endless beauty with this confident yet elegant design. We have also incorporated a unique pink diamond with every single one of our rings, symbolizing that hidden, unspoken emotion and feeling one carries in their heart about their significant other. This is not just another ring, this is a heirloom piece of jewelry. Demarco Bridal Engagement Ring.