Black Boulder Opal – Striking Blue & Green Broad Flash (5.1ct)

The Nightcloud Ember - A dark, mysterious black boulder opal with rolling blue‑green space‑cloud flashes drifting across its surface, the electric fire glowing like cosmic light swirling through a deep midnight sky.

This striking black boulder opal shows intense blue and green broad flash across its polished freeform surface, glowing vividly against the natural dark host rock.

With brightness 5, the colour play is exceptionally strong - the kind of electric blue that lights up even in low light. The black base enhances the contrast, giving the flashes a deep, dramatic look that collectors love.

At 5.1ct, it’s a compact but powerful stone, perfect for a high‑impact ring, pendant, or a collector’s display. Still attached to its natural ironstone host, it carries the authentic character of Queensland’s black boulder opal fields.

• Opal Type: Black Boulder Opal 
• Format: Seam
• Colour: Blue, Green 
• Pattern: Broad Flash
• Shape: Freeform 
• Finish: Polished 
• Brightness: B5 (of 5)
• Stone Dimensions: 15 × 8 × 3 mm
• Weight: 1.02 g (approx. 5.1 ct) 
• Fitting: None (loose stone) 
• Source: Miner‑direct
• Origin: Lightning Ridge Opal Fields Australia