I am enthusiastic too about the Duchess of Cambridge wearing he Queen-Mother's sapphire earrings! After the Papyrus tiara recently, Kate spoils us (at last!) with royal heirlooms!
The best close-up picture of these earrings was posted on this board by Annie in January 2015: http://members2.boardhost.com/royal-jewels/msg/1421545339.html Note that the diamonds surrounding the central sapphire of each earring and the tassels seem to be baguette diamonds.
Catherine also wore, along Princess Diana's sapphire engagement ring and QEQM's sapphire earrings, her diamond bracelet: