June's diamond center stones, whether mined or lab-created, are meticulously selected to order, ensuring they meet our stringent quality standards. Lab diamonds will be at least VS1 F grade, while mined diamonds will be SI1 H or better. Each stone is expertly certified and comes with a diamond certificate. We also offer higher or lower quality center stones upon request. June's moissanite center stones are precision-cut and of premium quality, guaranteeing VVS2 clarity and E color equivalent, though no certificate is provided.