Natural opal. Round cabochon. Starburst gypsy/flush setting. A stone whose color is not a pigment or an impurity — it is produced by light diffracting through a microscopic internal structure that exists in no other gemstone. October birthstone.

This natural opal star ring features a genuine natural opal round cabochon set flush within an engraved starburst setting on a dainty smooth band. The starburst engraving — fine radiating lines cut into the metal surface surrounding the stone — is worked directly into the setting metal, framing the opal with a celestial motif that echoes the stone’s own shifting internal light. The flush/gypsy setting holds the stone level with the surrounding metal surface, giving the ring a low, snag-free profile comfortable for everyday stacking. Available in 925 sterling silver, yellow gold plated, or rose gold plated in whole and quarter sizes from US 3 to 9 3/4. Handcrafted in Jaipur.

Ring Details

• Stone: Natural opal — round cabochon, play-of-color, October birthstone
• Setting: Starburst flush/gypsy setting — stone sits level with the metal surface; starburst engraving cut into surrounding metal
• Band: Dainty smooth band — low profile, comfortable for stacking
• Metal Options: 925 Sterling Silver · Yellow Gold Plated · Rose Gold Plated
• Sizes Available: US 3 to 9 3/4 including quarter sizes

What Is Play-of-Color? How Opal Works

Opal’s play-of-color — the shifting spectral flashes of red, orange, yellow, green, blue, and violet visible as the stone or viewer moves — is produced by a physical optical phenomenon called diffraction, entirely distinct from the color mechanisms of every other gemstone. Most colored gemstones derive their color from selective absorption: trace elements within the crystal structure absorb specific wavelengths of white light and transmit the remainder as a body color visible to the viewer. Amethyst absorbs yellow-green and transmits purple. Sapphire absorbs red-orange and transmits blue. The stone’s color is fixed and consistent regardless of viewing angle. Opal’s play-of-color works differently. Precious opal contains a regular, three-dimensional grid of silica (SiO₂) nanospheres — tiny spheres of amorphous silica packed in an ordered array throughout the stone’s interior, with void spaces between the spheres filled with water or additional silica. When the diameter of the silica spheres is within the range of visible light wavelengths (approximately 400–700 nanometers), the regular grid acts as a diffraction grating: white light entering the stone is separated into its component wavelengths, and different wavelengths are diffracted (scattered and redirected) at different angles. As the viewing angle changes — or as the light source moves — different wavelengths reach the viewer’s eye, producing the characteristic spectral color shifts across the stone’s face. Larger sphere diameters (closer to 700nm) produce red and orange at smaller viewing angles; smaller sphere diameters (closer to 400nm) produce blue and violet. Stones with spheres in the 250–400nm range produce blue and green play-of-color; stones with larger spheres in the 280–350nm range produce red and orange, which are the most prized and rarest play-of-color hues in opal. The pattern and distribution of play-of-color across the stone depends on the local arrangement and uniformity of the sphere array — which varies throughout the stone and is never replicated exactly between two stones. Every natural opal is therefore literally unique in its play-of-color pattern.

Natural Opal: Varieties and Sources

Opal is a hydrated amorphous silica (SiO₂·nH₂O) — not a crystalline mineral but a mineraloid, meaning it lacks the regular repeating atomic lattice of a true crystal. Its water content (typically 3–10% by weight, sometimes more) is integral to its structure. Australia is the world’s dominant opal source, producing approximately 95% of the world’s precious opal: Lightning Ridge in New South Wales is the primary source of black opal (the most prized variety, with play-of-color displayed against a dark body color); Coober Pedy in South Australia is the primary source of white or light opal (play-of-color on a white or light grey body); Andamooka and Mintabie produce additional light and semi-black opals. Ethiopian opal, primarily from the Wollo Province, has become a significant source since its emergence in the early 2000s and is known for strong play-of-color, often on a hydrophane body (a porous variety that absorbs water and becomes more transparent when wet). Mexican fire opal, from Querétaro, is an orange to red transparent opal that may or may not display play-of-color.

Opal Hardness, Porosity, and Care

Opal has a hardness of 5.5–6.5 Mohs — softer than quartz and most gemstone minerals, and considerably softer than sapphire or moissanite. More critically, opal contains water within its structure, and this water content is what makes opal care requirements more demanding than any other stone in ring wear. If opal loses water — through prolonged exposure to dry conditions, heat, or direct strong light — the stone can craze: develop a network of fine surface cracks as the structure contracts and the internal nanostructure loses its integrity. Crazing is irreversible and permanently damages the stone’s play-of-color. Conversely, sudden rehydration of a desiccated opal (e.g., soaking a dry stone in water) can cause stress fractures from rapid differential expansion. The correct care for opal is to keep it in stable, moderate humidity conditions — avoid prolonged exposure to very dry environments (air conditioning, desert climates, direct sun) and also avoid soaking. Wipe clean with a barely damp soft cloth and dry immediately. Remove before swimming, bathing, washing hands, or applying any chemicals, perfumes, or lotions. Ethiopian hydrophane opals require additional caution: they absorb water readily, which can temporarily alter play-of-color and may cause stress if the stone is repeatedly wet-then-dried.

Starburst Setting: Flush/Gypsy with Engraving

A gypsy or flush setting recesses the stone into a drilled or cut seat in the metal so the stone’s table (flat top surface) sits level with or slightly below the surrounding metal surface, with the metal closing around the stone’s girdle above the seat rather than leaving the girdle exposed as prongs or a bezel do. The result is a setting where the stone appears to sit within the metal itself rather than above it, giving the ring a smooth, continuous surface with no protruding prongs or bezel rim. This is the lowest-profile setting type available and produces the minimum possible snag risk during wear. The starburst engraving around the setting — fine V-cut grooves radiating outward from the stone’s edge across the ring’s face in a star pattern — is worked separately into the metal surface by a graver after the stone is set. The engraved lines catch and redirect light across the metal surface, creating a radiant effect that extends the visual impact of the opal outward beyond the stone’s physical boundary.

Stacking This Ring

The flush setting’s flat top surface and dainty band profile make this ring one of the most versatile stackers in the catalogue. The ring face sits at metal level, so adjacent stacked rings do not catch or push against a raised stone or bezel rim. The starburst engraving is visible between adjacent bands as long as there is a small gap, but is fully appreciated when the ring is worn solo or with one adjacent thin band on each side.

Care Instructions

• Critical: Remove before washing hands, swimming, bathing, or any water exposure — opal’s water content makes it sensitive to both wetting and drying cycles
• Avoid prolonged direct sunlight, heat sources, or very dry environments — these cause opal to lose water and can lead to irreversible crazing
• Wipe gently with a barely damp soft cloth only; dry immediately; never soak or use ultrasonic/steam cleaners
• Remove before applying perfumes, lotions, or hand sanitizers
• Opal is 5.5–6.5 Mohs — softer than most gemstones; store separately in a padded box away from harder stones
• Store in a stable, moderate-humidity environment — not in an airtight container (which can desiccate) and not in a humid bathroom

Sizing & Packaging

Please refer to our size guide image before ordering. Your ring ships in secure protective packaging. Any display boxes or props shown in photos are for styling purposes only.

Questions about sizing, metals, or custom requests? Message us — we're happy to help.