Rusty Thought is a Japanese jewelry brand by Ryo Katori. Vendor Twist Online notes the company uses “traditional jewelry making techniques such as ‘shippo-yaki’ (cloisonné enamel) and ‘ohaguro’ burning (resulting in a black rust effect on iron), Rusty Thought is a quiet, restrained collection of jewelry to be handed down to the next generation. Meant to show their individual patina over time as they change little by little with each day they are worn.”

The site explains, “This striking, elegant combination of stones gives this Rusty Thought ring its quiet luxury. Pale green and golden sapphire stones are asymmetrically cut and covered in a surface of light reflecting facets. They are set in hand-fabricated 18K yellow gold settings and centered on a 18K yellow gold band.Perfect for someone just beginning to collect fine jewelry, it could also be worn as a modern alternative to the traditional diamond engagement ring.”

It sells for USD$1,880.