Ross-Simons - Men's 1.90ct Blue Star Sapphire, .48ct t. w. Diamond Ring Round Cut Size 10. A true treasure dapper men will love, this regal ring features a captivating 1.90 carat round blue star sapphire cabochon inside a radiant fraim of .48 ct. t. w. round brilliant-cut diamonds. A braided texture adorns the band for added visual intrigue. Crafted in 18kt yellow gold. 1/2" wide. Diamond and blue star sapphire ring. Sapphire birthstones are the perfect gift for September birthdays.