Fireable White Opal – Green Fire Flash Moon Cabochon

✔ UK Stocked – Can be Dispatched Next Business Day

✔ Free UK Delivery on orders over £17 – Royal Mail (typically 1–2 days)

✔ Orders under £17 – Royal Mail 2nd class (£1.55)

✔ No international waiting times or customs delays

Galaxy Opal® Moon Cabochon White Opal Green Fire

(Only moon shaped opals until next order)

The fire of natural opal. The resilience of a lab. Galaxy Opal® is chemically identical to natural precious opal — composed of silica and water — delivering the same vivid play-of-colour and fire, with the extraordinary added benefit of heat resistance up to 900°C. Fireable in metal clay, kiln, torch, and compatible with borosilicate glass. Real opal. Unmined. Uncompromising.

• Lab-grown over approximately one year — chemically identical to natural opal
• Composed of silica and water — no resin
• No cracking, crazing or yellowing
• Crisp white with vivid green fire flash
• Heat resistant up to 900°C — compatible with borosilicate glass (33 COE)
• Suitable for glassblowing, lampworking, metal clay, kiln firing and torch firing
• Works well with jewellery plating
• Flat backed — ideal for resin inlay and clay work

Please note: These moon cabochons are 1mm depth — shallower than standard cabochons. This makes them perfect for resin inlay, clay embedding, and surface-set applications, but they are not recommended for bezel setting as the low profile does not provide sufficient purchase for most standard bezels.

Technical details: Mohs hardness 5.5 · Specific gravity 1.90–2.20 · Heat resistance up to 900°C. Chemical resistance to Thinner, Methanol, Acetone (OTHER CHEMICALS CAN DAMAGE THE OPAL.)

Perfect for pendants, statement jewellery, metal clay, glass blowing, inlay in glass, glass fusing, and resin work.

Galaxy Opal® is a versatile and innovative material — results will vary depending on your technique, tools, and firing method. The information provided is intended as a guide only; careful preparation and testing are recommended when firing in metal clay, kilns, or with a torch. Most of all, enjoy the process of creating!

Colour appearance may vary depending on lighting conditions and backing material. Images and videos are for illustrative purposes and the physical product may differ slightly.

Free PDF guide with every purchase · Join GalaxyVIP — our exclusive community for tutorials and updates across the full Fire Fusion opal range as and when they are available.