JAUCA

The JAUCA is a handcrafted tungsten carbide men's wedding band, 8mm wide, with a polished black tungsten domed body carrying two thin parallel yellow-gold-tone stripes running the full circumference across the crown. Built comfort-fit, inside-laser-engravable, and backed by our lifetime warranty - twin precision warm-gold lines on deep black.

The Metal

Tungsten carbide is the hardest wedding-band metal made - roughly 4× harder than titanium and 10× harder than 18k gold. That's not marketing language; it's a measurable Mohs hardness of 8.5-9. In practical terms: this band will not scratch from keys, tools, gym equipment, or daily contact with desks, steering wheels, or phone cases. It will look the same in five years as it looks the day you open the box.

The black tone on the JAUCA is a PVD (physical vapor deposition) finish bonded to the tungsten core at the molecular level - not paint or plating. It won't peel, strip, or wear through. The metal is fully hypoallergenic and nickel-free. The twin gold stripes are inlaid yellow-gold-tone tungsten lines, set evenly apart and flush across the crown.

Twin Gold Stripes on Black Dome

The JAUCA is the warm-tone version of the BOSTIN: the same twin-stripe geometric structure, but rendered in yellow gold instead of silver. Two parallel warm-gold stripes on a polished black tungsten dome, set evenly apart in a clean rhythmic pattern.

From a distance the band reads as a dark band with two bright warm-toned accent lines. Up close, the stripes show as crisp inlaid gold-tone tungsten cuts - flush, precise, architectural. It's a quiet ring built on geometric clarity and color contrast - black background, warm metal accent, two lines and nothing more.

Who It's For

The JAUCA is for the man who wants the geometric clarity of the BOSTIN with a warmer color story. If you wear black with gold accents (gold watch on dark leather, gold buckle on black belt), this band fits the same logic.

Key Features

• Tungsten carbide construction - 4× harder than titanium, 10× harder than 18k gold, scratch-resistant for daily wear
• Hypoallergenic - nickel-free, safe for sensitive skin
• Twin parallel yellow-gold-tone stripes on polished black tungsten domed body - clean rhythmic geometric inlay in warm gold
• 8mm width with smooth domed profile
• Comfort-fit interior - rounded inside for all-day wear
• Free inside laser engraving - up to 30 characters, any font
• Lifetime warranty + replacement sizing program - defect coverage and a replacement ring if your finger size changes (see warranty page)
• Ring sizes 7 - 15 (including half sizes)