THE 5D SCIENTIFIC EVALUATION SYSTEM
Natural mineral specimens require evaluation criteria distinct from cut gems. The MSGS framework codifies crystallographic habit perfection, matrix aesthetic contrast, damage thresholds, diaphaneity, and geological locality pedigree[cite: 7].
Crystal Habit Perfection
Assesses completeness of natural crystal form, symmetry, growth striations, twinning complexity (e.g. Japan Law), and freedom from dissolution etching.
Matrix & Contrast Balance
Measures visual proportion between host matrix and mineral crystals, color contrast against secondary paragenetic minerals, and native 3D balance[cite: 7].
Termination Damage Audit
Audits extraction damage, cleavages, bruised apex tips, and natural vs. extraction-induced fractures using 3D micro-optical inspection[cite: 7].
Diaphaneity & Luster
Quantifies crystal transparency (transparent to opaque), surface reflectance luster (vitreous, adamantine, sub-metallic), and internal phantom growth zoning[cite: 7].
Locality & Pedigree
Verifies accurate geographical locality (country, mine, pocket), historical collection pedigree, and association with academic literature or holotype records[cite: 7].
MSGS SPECIMEN CLASSIFICATION MATRIX
The official classification tiers under the ICIA MSGS Technical Standard for mineral specimens[cite: 7].
| TIER LEVEL | RATING DESIGNATION | 5D PREREQUISITE MATRIX | INSTITUTIONAL PURPOSE |
|---|---|---|---|
| Class M-1 (EX) | Museum Masterpiece 95–100 Points |
D1: Flawless habit geometry D2: Perfect 360° aesthetic matrix display[cite: 7] D3: 100% intact pristine terminations (Zero bruised tips)[cite: 7] D4: Water-clear / Exceptional luster D5: Exact pocket locality pedigree[cite: 7] |
National mineral museums, sovereign mineral archives, and landmark public exhibitions. |
| Class M-2 (VG) | Premier Collector 85–94 Points |
D1: High habit symmetry D2: Prominent matrix contrast D3: ≤2% microscopic peripheral contact damage[cite: 7] D4: High transparency and sharp luster D5: Verified mine and district locality |
Private connoisseur collections, high-end mineral galleries, and specialized auctions. |
| Class M-3 (G) | Cabinet Display 75–84 Points |
D1: Standard crystallographic habit D2: Balanced matrix or floater group D3: Minor contact fractures; repairs declared[cite: 7] D4: Good diaphaneity D5: General mining region confirmed |
Academic reference cabinets, study collections, and retail mineral galleries. |
| Class M-4 (ST) | Reference Specimen 60–74 Points |
D1: Partial or broken crystal habits D2: Heavy matrix without focal point D3: Noticeable extraction damage D4: Translucent to opaque D5: Locality data partial |
Educational university teaching sets, geological research, and beginner study. |
SPECIMEN INTERVENTION CODES & REPAIR RULES
In natural mineral curation, clean repairs are accepted when disclosed, but deceptive assembly triggers immediate disqualification[cite: 7].
[ UR ] Unrepaired Natural State[cite: 7]
Apex Holotype[cite: 7]
100% natural geological crystallization[cite: 5]. Micro-CT scanning and high-power UV fluorescence verify complete absence of adhesives, gap-fillers, internal metal support pins, or matrix rebuilding[cite: 7]. Fully eligible for Class M-1.
[ RP ] Native Repaired / Repaired[cite: 5, 7]
Disclosed Practice[cite: 5, 7]
Clean in-situ re-bonding of original mining contact fractures where the reattached crystal fragment originates from the exact same specimen[cite: 5, 7]. Fully accepted when disclosed on the certificate dossier[cite: 5, 7].
[ ST ] Matrix Stabilized[cite: 5, 7]
Permitted[cite: 7]
Polymer reinforcement applied exclusively to friable host rock to prevent matrix crumbling during transportation[cite: 5, 7]. Crystal faces must remain completely untouched by consolidants[cite: 7].
[ AS ] Reconstructed / Assembled[cite: 7]
Certificate Barred[cite: 7]
Artificial creation where crystals are glued into sculpted non-native matrix cavities, or missing terminations are fabricated from dyed epoxy[cite: 5, 7]. Disqualified from receiving an ICIA MSGS certificate[cite: 7].
MICRO-CT AUDITING & IGSTS 3D DIGITAL TWINS
Every museum-grade specimen certified under MSGS is mapped by industrial X-ray tomography and anchored to cert.icia.uk[cite: 7].
3D Micro-CT Tomography Scanning
Accredited OA-LAB facilities utilize non-destructive industrial micro-CT scanners to generate 360° cross-sectional slices through host rock and crystal attachments[cite: 7].
- • Matrix Pin Detection: Screens for internal steel or carbon fiber reinforcement pins[cite: 7].
- • Adhesive Density Mapping: Differentiates natural mineral contact zones from low-density synthetic resin seams[cite: 7].
IGSTS Specimen Digital Twin Dossier
The 3D point cloud and optical surface mesh of the specimen are permanently archived on cert.icia.uk[cite: 7]. Museums and collectors can rotate the interactive digital model, review raw CT slices, and confirm ADRPS warranty status[cite: 7].
- • 3D Surface Profilometry: Captures sub-millimeter crystal termination habits[cite: 7].
- • Locality Verification: Verified mine coordinates and paragenetic mineral validation[cite: 7].
Verify an MSGS Certificate or Submit a Specimen
Access the global ICIA digital twin registry to inspect certificate validity, examine 3D CT scans, or connect with an accredited OA-LAB to grade natural mineral specimens[cite: 7].