Non-diamond (Chert/Chalcedony Nodular Quartz)
Non-diamond (Chert/Chalcedony Nodular Quartz) · Uncut rough specimen with conchoidal fracture
None (Natural rough raw state) Cut
Carat
Estimated 1500 to 2500 carats based on hand-sized volume
Color
Opaque to translucent brownish-grey and tan
Clarity
Opaque; not applicable for faceted diamond grading
Shape
Uncut rough specimen with conchoidal fracture
Overall Assessment
This specimen is not a diamond. It is a nodule of cryptocrystalline quartz (chert or flint) characterized by a waxy luster and conchoidal fractures, commonly found in sedimentary limestone or chalk deposits.
Cut Quality
None (Natural rough raw state)
Brilliance
Very low (non-adamantine)
Fire
None
Scintillation
None
Proportions
Irregular natural mass
Symmetry
Asymmetrical natural nodule
Polish
Dull to waxy natural luster; no manual polish
Fluorescence
Likely inert (None)
Inclusions
Mineral banding, sedimentary matrix, and internal fractures
Blemishes
Surface pitting, impact scars, and chalky exterior cortex
Origin
Sedimentary rock formation (likely a flint or chert nodule)
Treatment Detection
None detected; natural raw state
Estimated Value
Low nominal value as a geological specimen ($5-$20)
Certification Estimate
Not eligible for GIA/AGS diamond grading; local geological ID only
Investment Potential
None for gemstone investment
Similar Diamonds
None; this material is cryptocrystalline quartz, not carbon-based diamond
Setting Suggestions
Not suitable for traditional jewelry setting; display or tumble finishing only
Care & Maintenance
Avoid heavy impact; wash with mild soap and water
Interesting Facts
Chert and flint were historically used for tool-making due to their sharp conchoidal fracture edges.