Sterling silver Vintage cushion blue topaz John Hardy "Kali" stud earrings. John Hardy is a jewelry brand founded by Canadian-born designer John Hardy. After traveling the world, he settled in Bali and began working with local artisans to learn traditional jewelry-making techniques. In 1975 he started his own jewelry company there. The Kali Collection is inspired by the organic shapes found in nature, most notably the "pebble" motif.