Inclusions¶
Diagnostic inclusions and fingerprinting techniques for gem identification.
Interactive Version
For detailed data tables and interactive content, visit gemmology.dev/learn/inclusions.
Types of Inclusions¶
Solid Inclusions¶
Crystals of other minerals trapped during growth.
| Host Gem | Common Inclusions |
|---|---|
| Ruby/Sapphire | Rutile silk, zircon halos, calcite |
| Emerald | Pyrite, calcite, tremolite, mica |
| Diamond | Garnet, olivine, chromite |
Fluid Inclusions¶
- Two-phase - Liquid + gas bubble
- Three-phase - Liquid + gas + solid crystal (diagnostic for Colombian emerald)
- Fingerprint inclusions - Healed fractures with fluid remnants
Growth Features¶
- Colour zoning
- Growth tubes
- Twinning
- Phantoms
Origin Determination¶
Corundum by Origin¶
| Origin | Characteristic Inclusions |
|---|---|
| Burma (Ruby) | Short rutile silk, calcite, swirl patterns |
| Kashmir (Sapphire) | Tourmaline, zircon halos, milky zones |
| Sri Lanka | Long rutile silk, hexagonal colour zoning |
Emerald by Origin¶
| Origin | Characteristic Inclusions |
|---|---|
| Colombia | Three-phase inclusions with halite cube |
| Zambia | Black mica flakes, amphibole needles |
| Brazil | Biotite mica, pyrite |
Natural vs Synthetic¶
| Natural Indicators | Synthetic Indicators |
|---|---|
| Mineral inclusions | Curved striae |
| Three-phase inclusions | Gas bubbles |
| Fingerprint patterns | Flux inclusions |
| Irregular zoning | Chevron zoning |
Data source: learn/inclusions.yaml