Natural Resin-Free Opal Gemstone, with no resin filling or stabilization treatment, preserving the opal’s original play of color and clear, vivid brilliance. Its colors are rich and transparent, with strong fire and natural optical layers.

This fire opal gemstone is chemically identical to natural precious opal, composed of 100% silicon dioxide (SiO₂), and shares the same hardness, brightness, and fire. The only difference is its origin. With a hardness of 5.5 and excellent thermal stability, it can withstand temperatures of around 900°C, making it especially suitable for high-temperature applications such as borosilicate glass processing and glass-blowing art.

Compared with ordinary decorative opals, resin-free opal maintains its structure and color even under extreme heat, making it an ideal material for professional glass artists, high-temperature craftsmanship, and premium artistic creations.

Specifications:

Material: Natural Resin-Free Opal (Loose Stone)
Composition: 100% Silicon Dioxide (SiO₂)
Hardness: 5.5
Heat Resistance: Up to approx. 900°C
Applications: Borosilicate glass, glass blowing, high-temperature precision crafts, collection and display
Size: 2~4mm