Not a diamond; appears to be an opal or rough mineral with play-of-color, potentially embedded in a matrix or oxidized setting.
Not a diamond; appears to be an opal or rough mineral with play-of-color, potentially embedded in a matrix or oxidized setting. · Irregular / Rough cabochon or crystal fragment
Poor / Rough uncut or crudely shaped material Cut
Carat
Cannot accurately determine visually due to matrix obstruction, roughly estimated at 1.0 - 2.0 carats based on visible portion.
Color
Not applicable (Fancy Blue/Violet play-of-color)
Clarity
Not applicable to opals (Contains natural inclusions and crazing)
Shape
Irregular / Rough cabochon or crystal fragment
Overall Assessment
The item in the image is not a diamond, but rather a rough specimen displaying vibrant blue play-of-color, likely an opal set in a heavily oxidized or dirt-encrusted mounting. Professional cleaning and gemological testing are recommended to confirm the exact mineral species.
Cut Quality
Poor / Rough uncut or crudely shaped material
Brilliance
Varies; exhibits localized vitreous to sub-vitreous luster with bright flashes
Fire
High color play (spectral flashes of electric blue and violet)
Scintillation
Flashes of blue light shifting with movement
Proportions
Non-standard proportions due to rough/natural state
Symmetry
Poor / Irregular
Polish
Poor / Raw or heavily weathered surface
Fluorescence
Strong blue play-of-color flash under natural light
Inclusions
Natural internal fractures, potch lines, and matrix inclusions
Blemishes
Surface abrasions, pitting, and adhering dirt/oxidation from setting
Origin
Likely natural origin (potential Australian or Ethiopian matrix opal source based on appearance)
Treatment Detection
Needs laboratory testing to rule out stabilization, impregnation, or doublet/triplet assembly
Estimated Value
Low to moderate depending on exact gem species, stability, and weight once extracted from matrix ($50 - $300)
Certification Estimate
Gemological testing needed (e.g., GIA or GRS for species identification as precious opal)
Investment Potential
Low as a speculative gem; high sentimental or collector value if found as a personal piece
Similar Diamonds
None (this is not a diamond)
Setting Suggestions
Bezel setting in silver or yellow gold once properly cleaned and stabilized
Care & Maintenance
Requires careful cleaning to avoid damaging the porous matrix; avoid harsh chemicals, ultrasonic cleaners, and sudden temperature changes
Interesting Facts
Opals contain up to 20% water and can craze or crack if allowed to dry out too quickly