Strada R732-2CENTER STONE ACCOMMODATION This immaculate Michael M engagement ring is displayed with a stunning round shaped center diamond (not included at time of purchase), and can fit an array of diamonds ranging in size from 1. 85 carats to 2. 10 carats. For information on this engagement ring and others, please consult your local authorized Michael M retailer. Additionally, we can set the diamond shapes with minor head modifications at no additional cost.