√-16 (Sqrt-16) is an independent luxury eyewear house based in Marin County, California—where design, mathematics, and craftsmanship intersect.
Inspired by the concept of 4i (“four-eye”).

√-16 represents a different way of seeing—one that values depth, precision, and individuality.
Each frame is handcrafted in Italy and Japan by master artisans, using Mazzucchelli acetate and Japanese titanium—materials chosen for their strength, beauty, and longevity.

Founded by husband and wife Red Kakar and Diana Lopez, √-16 is built on a shared belief:that true luxury lies in intention, detail, and perspective.