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

Both tones on the CALLISTO are PVD (physical vapor deposition) finishes bonded to the tungsten core at the molecular level - not paint or plating. Neither can peel, strip, or wear through. The metal is fully hypoallergenic and nickel-free. The dome is mirror-polished jet black; the twin grooves are recessed and finished in polished warm yellow gold.

Twin Yellow Gold Grooves on Polished Black

The CALLISTO is built on contrast: a deep mirror-polished black tungsten dome cut by two thin parallel warm-gold lines. The grooves are precision-recessed into the surface and filled with polished yellow-gold-tone PVD, so they sit slightly below the polished black surface - protected from contact, sharp under light.

From a distance the ring reads as a glossy dark band with two bright accent lines. Up close, the parallel symmetry of the gold grooves becomes the design - restrained, deliberate, geometric. It's a wedding band that gets its character from two precise lines rather than a wide inlay.

Who It's For

The CALLISTO is for the man who likes restraint with one bold accent - black-on-gold logic, monochrome with deliberate metallic detail. If you wear minimalist black with a single warm-metal element, this band fits that aesthetic.

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
• Polished black tungsten domed body with twin yellow-gold-tone parallel grooves - twin warm-gold accent lines on deep mirror-polished black
• 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)