Vintage Old Mine Cut Diamond Cluster Engagement RingVintage Old Mine Cut Diamond Cluster Engagement Ring. This vintage engagement ring features a cluster of Old Mine cut diamonds totaling 1. 09 carats and is set in platinum with a yellow gold band. The cluster is beautifully set in a design resembling a star, whose points separate each of the outer diamonds with milgrain edges. Below the basket the high polish of the yellow gold band glows in a warm tone, providing this ring with a second muted tone