Pear-shaped tanzanites circled by diamonds in a platinum setting. Kate debuted these on March 13, 2015 at the Afghanistan Service at St. Paul's. The earrings come with a matching necklace. They are by G. Collins & Sons, a bespoke jeweler who holds a Royal Warrant. In 2007, Her Majesty, the Queen replaced Garrard with G. Collins as the Crown Jeweler with the responsibility of maintaining the Crown Jewels. It appears the earrings can be worn with or without the extra diamonds at the stud. No price is available as the earrings were not for sale when the Duchess first wore them.
Photo credit: G. Collins & Sons Instagram