Not a diamond; this is a faceted quartz crystal, possibly quartz with inclusions or a glass simulant, but visually identifiable as a quartz mineral specimen rather than carbon diamond.
Not a diamond; this is a faceted quartz crystal, possibly quartz with inclusions or a glass simulant, but visually identifiable as a quartz mineral specimen rather than carbon diamond. · Custom carved rectangular block / tabular crystal form
Hand-carved / polished mineral specimen rather than a standard brilliant-cut gemstone. Cut
Carat
Significantly large specimen, estimated over 100 carats if measured in gemstone weight equivalent, though it is primarily a mineral specimen.
Color
Colorless to pale yellow with iridescent internal rainbow interference patterns (likely thin-film interference from fractures or inclusions).
Clarity
Included / Heavily flawed with prominent internal fractures, feathers, and trapped mineral inclusions producing optical rainbows.
Shape
Custom carved rectangular block / tabular crystal form
Overall Assessment
This is a fascinating natural mineral specimen—specifically a quartz crystal featuring dramatic internal fractures and rainbow-producing inclusions—rather than a diamond. It makes for an eye-catching display piece or collector's item.
Cut Quality
Hand-carved / polished mineral specimen rather than a standard brilliant-cut gemstone.
Brilliance
Low to moderate brilliance due to massive internal fracturing and inclusions disrupting light return.
Fire
High chromatic dispersion visible through internal fracture planes acting as prisms, though not true diamond fire.
Scintillation
Flashes of spectral color from internal fractures rather than standard facet-based scintillation.
Proportions
Non-standard custom block proportions with a large flat top table and deep body.
Symmetry
Irregular, artisanal crystal carving symmetry.
Polish
Fair polish with visible striations and tool marks on facets.
Fluorescence
Unable to determine without UV testing equipment.
Inclusions
Prominent internal fractures, healing planes, and localized iron-staining/patina.
Blemishes
Surface scratches, chips along edges, and natural growth irregularities.
Origin
Natural mineral origin, likely a quartz crystal from a pegmatite or hydrothermal vein deposit.
Treatment Detection
No obvious artificial treatments detected, though internal fractures may show natural iridescent coating (often called 'fire quartz' or 'rainbow quartz').
Estimated Value
Nominal value as a mineral specimen or decorative curio, highly dependent on aesthetic appeal rather than gemstone market value.
Certification Estimate
Not applicable for standard diamond grading labs (GIA/AGS); would require a gemological laboratory identification report (e.g., GIA colored stone or mineral report).
Investment Potential
Low investment potential; valued primarily as a decorative mineral specimen rather than a liquid financial asset.
Similar Diamonds
None, as this is a quartz mineral specimen and not a diamond.
Setting Suggestions
Wire-wrapped pendant setting or custom bezel mounting suitable for large mineral specimens.
Care & Maintenance
Handle with care to prevent chipping along internal fracture planes; clean gently with warm soapy water and a soft brush.
Interesting Facts
The rainbow effect inside the crystal is caused by light diffracting through microscopic micro-fractures, a phenomenon often referred to in the trade as 'iris quartz' or 'fire quartz.'