Black Spinel or Onyx (Likely non-diamond simulant)
Black Spinel or Onyx (Likely non-diamond simulant) · Square Cushion Checkerboard Cut
Fair (Custom Checkerboard) Cut
Carat
Estimated 2.5 - 3.5 carats based on dimensions
Color
Opaque Black
Clarity
Opaque (N/A)
Shape
Square Cushion Checkerboard Cut
Overall Assessment
This appears to be a decorative fashion ring featuring a black gemstone simulant, such as Onyx or Spinel, rather than a carbon-based black diamond. The setting suggests a silver or base-metal composition common in masculine fashion accessory styles.
Cut Quality
Fair (Custom Checkerboard)
Brilliance
Low (Lustrous rather than brilliant)
Fire
None
Scintillation
Mild surface reflection from checkerboard facets
Proportions
High crown with checkerboard faceting, shallow pavilion for ring setting
Symmetry
Good
Polish
Good
Fluorescence
None
Inclusions
Not visible due to opacity
Blemishes
Minor surface abrasions consistent with wear on soft stone
Origin
Likely synthetic or abundant natural mineral (Brazil or Thailand)
Treatment Detection
Likely dyed if Onyx; natural if Black Spinel
Estimated Value
$20 - $150 (depending on metal composition)
Certification Estimate
Not typically certified by GIA; local jeweler appraisal suggested
Investment Potential
Low (Fashion jewelry category)
Similar Diamonds
Black Carbonado Diamond (though this lacks the metallic luster)
Setting Suggestions
Currently in a silver-toned signet style mounting with claw prongs
Care & Maintenance
Clean with mild soap and warm water; avoid ultrasonic cleaners
Interesting Facts
Checkerboard cuts are designed to maximize surface reflection on opaque stones