Crushed Alexandrite & Fire Opal Wedding Band in Tungsten (4mm)

This slim 4mm cosmic tungsten wedding band sets a vivid purple nebula inlay — crushed alexandrite, galaxy goldstone, and fire opal — into polished tungsten carbide, like a swirl of deep space caught on the finger. Inspired by the violet glow of the Crab Nebula, the narrow profile wears cleanly on its own or stacks beautifully alongside an engagement ring, and reads elegantly across women's, men's, and unisex hands. Ships with a free luxury velvet jewelry box and free USA shipping.

The inlay: a purple nebula on the finger

The channel layers three materials into one cosmic scene. Crushed alexandrite — the color-change chrysoberyl — brings deep violet fragments; galaxy goldstone adds a field of glittering copper flecks; and fire opal scatters occasional iridescent flashes of color through the deep purple. Set flush in a clear resin matrix, the effect reads as stellar dust and energy swirling beneath a mirror surface. Because the inlay is crushed and hand-set, no two rings are ever identical — yours will share the same nebula character as our photos with its own arrangement of sparkle. Drawn to purple stones? Our purple gemstones guide explores the color's meaning and history.

Galaxy goldstone, the star-field material

The shimmering base of the inlay is galaxy goldstone — also called purple sandstone — a richly coppered material handcrafted in the Venetian glass tradition, first perfected by Italian glassmakers in the 17th century. Its suspended copper crystals catch and throw light in a starfield-like pattern, which is exactly what gives this band its deep-space glow.

A permanent, consistent purple

Alexandrite is known for shifting color between daylight and lamplight. Here the alexandrite is sealed beneath the resin inlay, so rather than shifting, it settles into one rich, constant violet — a permanent purple that always reads the same, day or night. It's the right choice for the cosmic aesthetic and the symbolism of alexandrite as a stone of transformation; if you're after a visible color-change effect, that's better suited to an open-set faceted stone.

Why tungsten carbide

Tungsten carbide is one of the hardest metals used in fine jewelry — about four times harder than titanium, five times harder than steel, and ten times harder than gold. It holds its mirror polish for years, shrugs off the scratches that dull softer metals, and won't bend or lose its shape. It's also hypoallergenic and nickel-free. Curious how it holds up? Read do tungsten rings scratch? and titanium vs tungsten rings.

Slim 4mm profile, made to stack

At 4mm this band reads slim and refined rather than bold — wearable as a women's wedding band, a unisex band, or a narrow men's band, and ideal for stacking. Tungsten's hardness means it sits cleanly next to an engagement ring without wearing at the point where the two meet, while the cosmic inlay adds color without competing for attention. We also offer this same nebula design in a substantial 8mm width, so couples can wear a matching pair across widths.

Specifications

Why partners choose this ring

• A slim cosmic band for partners drawn to space, astronomy, and sci-fi aesthetics
• A unisex or matching-pair band — wear it alongside the 8mm version
• A stacking band that sits cleanly next to an engagement ring
• A daily-wear band — see our guide to non-traditional men's wedding bands

Sizing & care

This band runs true to size — we recommend confirming your ring size before ordering; a local jeweler can measure you in minutes. Choosing between widths? Our men's wedding band width guide breaks it down, and for everything about tungsten sizing and fit, see can tungsten rings be resized or cut off? The sealed inlay handles everyday water and hand-washing; wipe with a soft cloth to keep the mirror polish, and remove it around harsh chemicals like chlorine.

Love this look? Explore the full tungsten rings collection, or browse matching styles in our couples rings collection.