Four Nines

Four Nines, written as 999.9 and pronounced “Four Nines,” is an eyewear brand whose name refers to the purity marking on a gold ingot. The figure represents a purity of at least 999.9 parts per thousand, and expresses the brand’s pursuit of the highest possible quality. Four Nines describes its approach to making products as a continuing effort to refine every detail and get as close as possible to perfection.

The brand offers optical frames and sunglasses, with collections that include metal, plastic, and combination designs, as well as options in materials such as buffalo horn, tortoiseshell, carbon, and gold. Its range spans shapes including square, Wellington, oval, Boston, round, and rimless styles. The website also features lens and accessory offerings, collection information, product searches, and a journal exploring comfort and design details. Customers can use the store locator to find nearby shops. Four Nines presents its eyewear through a focus on considered craftsmanship, comfort, and ongoing product development.