.30 Vintage Retro Diamond Cluster Engagement Ring 18kThis Retro era engagement ring features a flower cluster design with a . 06 carat old European cut center diamond surrounded by six . 04 carat round brilliant cut diamonds in 18K two tone gold. The center diamond grades SI1 in clarity, meaning small inclusions are only visible under magnification, and L in color, which shows warmth but still sparkles well. Old European cuts were hand cut and throw light differently than modern rounds, creating softer,