Natural
Natural · Old Mine Cut / Cushion
Fair (Antique cut standard) Cut
Carat
0.25 - 0.35 carats
Color
K-M (Faint Yellow)
Clarity
SI1 - SI2
Shape
Old Mine Cut / Cushion
Overall Assessment
An authentic example of an antique Old Mine cut diamond. While it lacks the precision and brightness of modern stones, it possesses significant historical character and a warm, chunky light return typical of late 1800s jewelry.
Cut Quality
Fair (Antique cut standard)
Brilliance
Moderate; characterized by a 'blocky' light return rather than modern splintery brilliance.
Fire
High; antique cuts are known for strong dispersion under candlelight or dim lighting.
Scintillation
Low; slow flashes of light due to large facets.
Proportions
High crown, small table, deep pavilion, and large culet typical of late 19th/early 20th century stones.
Symmetry
Fair
Polish
Fair
Fluorescence
Indeterminate without UV
Inclusions
Crystals and feathers visible under magnification, primarily located near the girdle.
Blemishes
Surface abrasions and minor nicks on facet junctions consistent with age and wear in a heavy mounting.
Origin
Likely South Africa or Brazil; typical of Victorian/Edwardian era material.
Treatment Detection
None apparent; fits the profile of an untreated antique stone.
Estimated Value
$400 - $700 USD (Diamond value only, excluding mounting).
Certification Estimate
GIA (Antique Diamond Report); estimated K/SI2.
Investment Potential
Low as a single stone; higher as a complete piece of signed or high-quality period jewelry.
Similar Diamonds
Antique Old Mine Brilliant or early Cushion modified brilliant.
Setting Suggestions
Best kept in its original antique yellow gold mounting to preserve historical context and minimize color visibility.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners if feathers reach the surface.
Interesting Facts
Old Mine cuts were hand-faceted before the invention of the power-driven circular diamond saw, making each stone unique.