Research Center — Published Field Documentation
African “Fingerprint” Ruby — Preliminary Field Record
Preliminary field and microscopy observations of a 95.60 ct specimen. Identity, natural or synthetic status, treatment history, and origin require confirmation by an independent qualified laboratory.
Field specimen as documented in the original record. Photography and documentation by Eman Galeb Hamza.
- Archive ID
- AFR-RBY-FP-20251021–1747
- Author / documentation
- Eman Galeb Hamza — EmanelleGrace9
- Series
- EGP Scientific Reference Series
- Original publication
- Medium — 12 January 2026
Source publication: Original Medium article — African “Fingerprint” Ruby
Specimen Record
- Preliminary field description
- Reported as corundum, ruby variety; laboratory confirmation is required
- Weight
- 95.60 ct / 19.12 g
- Transparency
- Semi-translucent to moderately opaque
- Luster
- Vitreous to greasy
- Surface observation
- Pronounced surface striations, described visually as a “fingerprint” texture
- Reported field origin
- Mozambique / Tanzania — reported in the original field record; NOT independently confirmed and NOT a laboratory origin determination
- Response to intense light / UV
- Strong red response reported; its cause requires analytical confirmation
- Preliminary microscopy
- Record describes silk-like, tube-like, and zoning features; their identities and significance are unconfirmed
- Heat-related features
- No conclusion can be established from the preliminary observations; laboratory testing is required
Observation
A rough specimen of 95.60 ct (19.12 g) was described at field level as semi-translucent to moderately opaque, with a vitreous-to-greasy luster. Its surface shows pronounced striations forming a dense, ridge-like pattern described visually as a “fingerprint” texture. A strong red response under intense light and ultraviolet illumination was reported. Preliminary microscopy recorded silk-like, tube-like, and zoning features. These are visual observations only; their identity and diagnostic significance have not been confirmed.
Interpretation
The reported red response and the recorded silk-like, tube-like, and zoning features may be relevant to a corundum assessment, but they are not diagnostic on their own. Their composition and significance require appropriate measurements and analytical testing. Individually or together, these observations do not establish identity, natural or synthetic status, treatment history, or geographic origin. Mozambique / Tanzania is retained only as user-reported field provenance and has not been independently confirmed.
Conclusion and required confirmation
The record supports only a preliminary field description of a specimen reported as corundum of the ruby variety. Refractive index measurement and appropriate advanced testing, which may include FTIR and/or Raman spectroscopy, are required to confirm identity and assess natural or synthetic status, treatment history, and geographic origin. Confirmation must come from an independent qualified gemological laboratory.