White Opal Lightning Ridge · Green Flash Cabochon

Lightning Ridge (NSW, Australia) white opal cabochon with green flash, hand-cut in our lapidary workshop. Rounded freeform, uncalibrated. Back with natural fracture documented in gallery—does not affect the visible face or bezel setting.

Piece Details

This Specific Piece

The green flash is distributed in diagonal veins across the cabochon's face. The play-of-color is visible with direct light and has directional behavior: its intensity changes depending on the angle of the light source. The background transparency, characteristic of Lightning Ridge white opal, allows the color to be seen without the interference of an opaque dark base.

The fracture on the back does not reach the visible surface or compromise a closed bezel setting: the metal covers and protects the reverse. Many jewelers add neutral epoxy to the bottom of the bezel for additional stabilization. See detail in the gallery.

How Opal's Fire Forms

Opal is an amorphous mineraloid of hydrated silica (SiO₂·nH₂O). Its play-of-color arises from the diffraction of white light through layers of silica microspheres arranged in three-dimensional lattices. When the diameter of these spheres matches wavelengths of the visible spectrum, the opal refracts a specific color. Lightning Ridge produces opal in a wide range: from black—the most prized—to milky translucent white, like this piece, where the flash stands out against the clear base.

For What Setting It Works

• Bezel setting (925 silver or other precious metals) — the closed bezel is the ideal option for opal: it protects the edges (5.5–6 Mohs) and stabilizes the back. Many jewelers fill the bottom of the bezel with neutral epoxy before closing.
• Pendant with silver setting — the rounded freeform fits into organic bezel settings where the irregular silhouette is the protagonist.
• Wire wrap — possible with soft perimeter wrapping technique in silver or copper wire; avoid excessive pressure on the edges given the 6 Mohs hardness.

Lightning Ridge Opal in Lapidary Tradition

Lightning Ridge (NSW) is the world's leading black opal deposit. Mining remains artisanal: fossickers work individual claims in search of nodules. White opal from the same field shares the geology but its milky base creates a different contrast with the flash.

In crystal tradition, opal is associated with creativity and inspiration. The flash that changes with light becomes a symbol of moving perspective: the same stone, always seen differently.

The symbolic properties attributed to minerals belong to cultural and historical traditions. They are shared for educational purposes, not as medical advice.

Frequently Asked Questions

What exactly is the fracture on the back?

A natural fracture line on the back of the cabochon, visible in the gallery images. It does not reach the display face or affect the flash. In a closed bezel setting, the back is sealed by the metal and, optionally, by neutral epoxy which stabilizes the fracture.

Is it solid opal or a composite?

Solid. No additional detectable treatment. Statement based on lapidary observation. The piece does not include formal gemological certification.

How to care for opal?

Opal is sensitive to sudden temperature changes, solvents, and dehydration. Clean with a soft, damp cloth only. Avoid steam and ultrasonics. Store in a soft cloth or case away from heat sources. See the complete guide in jewelry care.

Is the green flash always visible or only in some positions?

The flash is directional: maximum intensity with direct overhead light or at 30–45° relative to the face's plane. With diffuse or lateral light, the flash may reduce—normal behavior of genuine play-of-color.

See also: lapidary collection · all cabochons.