Ray-Ban RB3721 18813 — Brown On Gunmetal

Brown on gunmetal metal construction define the Ray-Ban RB3721 18813, a sunglass from Ray-Ban's current best-selling lineup.

Finished in Brown On Gunmetal, this colorway gives the RB3721 silhouette its own character.

Brown On Gunmetal

The 18813 Brown On Gunmetal colorway pairs the RB3721 frame with a distinctive finish.

Built in metal, the frame offers the durability and feel Ray-Ban is known for.

The Original Sunglass Brand

Ray-Ban was founded in 1937, born from a U.S. Army Air Corps request for glare-cutting lenses for pilots — the origin of the Aviator. The Wayfarer followed in 1952 and became one of the most recognizable frame shapes ever made. Few brands own sunglass history the way Ray-Ban does.

Timeless Shapes, Honest Build

Ray-Ban's best sellers endure because the shapes are resolved and the construction is straightforward. These are sunglasses designed to be worn daily for years — classic proportions, reliable hinges, and lenses in the brand's signature green, grey, and brown families.

Square Shape

A square front gives strong definition and a bold, graphic read — structured lines that anchor the face.

Adjustable Nosepads

The RB3721 is built with adjustable nosepads for a more secure, comfortable position on the face.

Why We Love This Color

Brown On Gunmetal sits confidently in the RB3721 lineup — pairing brown on gunmetal framing with tinted lenses for a look that works across the wardrobe.

Prescription Options

The RB3721 can be customized with prescription sunglass lenses to meet your prescription needs.

At Deziner Eyecare, ask about premium prescription sun lenses, customized grey and fashion tints, polarized options, and advanced anti-reflective treatments.

Product Details

Brand: Ray-Ban
Model: RB3721
Color Code: 18813
Frame Color: Brown On Gunmetal
Frame Material: Metal
Lens Material: Polycarbonate
Frame Shape: Square
Frame Type: Full Rim
Fit: Adjustable Nosepads
Gender: Unisex
Prescription Compatible: Depending on prescription
Lens Width: 59 mm
Bridge Width: 17 mm
Temple Length: 145 mm
Lens Height: 45 mm
Size: 59-17-145 mm

The Look

Brown On Gunmetal. Ray-Ban design.

The Ray-Ban RB3721 18813 pairs brown on gunmetal framing with tinted lenses — a best-selling Ray-Ban sunglass, ready to wear.