A 3mm Lightning Ridge black opal, set in an adjustable 925 silver open spiral ring. The stone is small – pinpoint-sized – but it contains the same play-of-color that makes black opal the most contrasting gemstone with flashes of color available. The size adjusts between 14 and 17 (Spanish sizing).
Item details
| Mineral |
Black Opal (amorphous hydrated opal, black body) |
| Stone dimensions |
3 mm round cabochon |
| Size |
Adjustable 14–17 (Spanish scale) |
| Shape and back |
Round cabochon, cup setting |
| Finish |
Mirror polish (stone) · Polished 925 silver |
| Hardness |
5.5–6.5 Mohs — daily use with care; avoid direct impacts and chemicals |
| Metal |
925 Sterling Silver |
| Origin |
Lightning Ridge, New South Wales, Australia |
| Treatment |
Untreated |
| Item type |
One-of-a-kind |
This specific piece
The 3mm black opal is set in a silver cup: the classic setting for small, round stones, which elevates the stone above the band and exposes it to light from all angles. At this scale, the play-of-color of Lightning Ridge black opal is particularly intense: the dark background acts as a screen, and the flashes – electric blue, with green reflections depending on the angle – seem disproportionate to the size of the stone. The open spiral band allows for size adjustment between 14 and 17 (Spanish sizing) without tools.
How black opal's play-of-color forms
Opal is amorphous hydrated silica with nanometer-sized silica spheres arranged in three-dimensional grids. When light passes through these grids, it diffracts into visible spectrum wavelengths – the color depends on the diameter of the spheres: ~200 nm diffract green; ~250 nm, orange and red. Lightning Ridge black opal formed in carbon-rich clay from the Australian Cretaceous: the dark background amplifies the contrast of the flashes to make them practically luminescent.
Black opal in lapidary tradition
Lightning Ridge (New South Wales, Australia) was not commercially mapped until the early 20th century: the first pieces arrived in London around 1903. Before that discovery, the dark body of the opal was considered a flaw. The discovery of Lightning Ridge reversed the scale of value: the black body became the indicator of maximum quality because it amplifies the play-of-color like no other base. Today, it is the most respected source of gem-quality black opal in the world. In crystal traditions, it is associated with deep intuition and unfiltered creativity.
The symbolic properties attributed to minerals belong to cultural and historical traditions. They are shared for educational purposes, not as medical advice or a substitute for professional care.
How to recognize genuine Lightning Ridge black opal
Genuine black opal has a dark body visible at the edges and base, and active, complex play-of-color that changes when the piece is moved. The most common imitations are doublets or triplets – a thin sheet of opal over black glass, detectable by looking at the profile under magnification: the joint line is visible – and opalite or synthetic silica glass, which shows uniform blue-pink iridescence without real play-of-color.
Frequently Asked Questions
Has the black opal received any treatment?
No detectable treatment. Statement based on lapidary observation; the piece does not include formal gemological certification. The dark body is natural to the Lightning Ridge formation, not applied dye or backing.
How is the ring size adjusted?
The spiral band allows you to expand or reduce the size by gently pressing the end of the spiral inward or outward. The comfortable range is size 14 to 17 (Spanish sizing). The stone is set in a separate cup; the adjustment affects the band, not the setting.
Is this piece unique?
Yes. The play-of-color of Lightning Ridge black opal is unrepeatable: no two stones have the same pattern of flashes. This is the only piece available with this specific cabochon.
How do I care for this ring?
Consult our complete guide in jewelry care. For opal: avoid exposure to chemicals, chlorinated or salt water, and sudden temperature changes. Store in a soft pouch, separate from other pieces.
See also: all handmade rings · silver jewelry.
