Yellow sapphire earrings in solid 14k gold and platinum. Natural yellow sapphire is corundum, a Mohs 9, so its warm golden colour comes on one of the hardest stones you can wear every day. The collection is design-led: a bar and a bar drop, a geometric hoop, a yellow-and-pink two-stone pair, and diamond-set geometric styles up to 3/8 ct. Every pair is made to order and ships fully insured.