Comment Explanation WGL Lab
This guide explains the specific codes and comments used by WGL Lab to document treatments applied to gemstones.
| Code |
Treatment Explanation |
| No Treatment Detected |
No enhancement process detected. |
| No indications of heating |
No indications of a heating process. |
| H |
Enhanced by Heat (no residue present). |
| H(a) |
Enhanced by Heat with **solid Flux residue** present in fissures. |
| H(a)* |
Enhanced by Heat with **solid Flux and glass residue** present in fissure. |
| H(c) |
Enhanced by Heat with **lead glass, bismuth, etc.** (extensive glass filling). |
| H(c)-Dyed |
Enhanced by Heat with lead glass + **infused coloring agent**. |
| H(Be) – Beryllium |
Enhanced by Heat and **light elements** such as beryllium (Diffusion). |
| None-Normally heated |
Heating process is commonly used and commonly acceptable. |
| Code |
Treatment Explanation |
| D – Diffusion |
Enhanced by heat with chemicals to enhance color. |
| D – Dyed |
Underwent dyeing treatment to enhance color. |
| C – Coating |
Undergone a surface coating treatment to enhance color. |
| None-Normally irradiated |
Irradiation process is commonly used and commonly acceptable. |
| IMP |
**Impregnated** with a polymer or resin to improve clarity, stability, durability. |
| Doublet/Triplet |
Assembled stone fused together. |
| Lab Created |
Lab Created/Synthetic stone. |
| None-Treatment not Detected |
Treatment is undeterminable. |
🟢 Emerald Clarity Enhancement (Ce)
**Ce** refers to clarity enhancement in emeralds by filling surface-reaching fractures with oil or resin.
| Ce Code |
Amount of Oil/Resin Present |
| Ce – None |
Oil or resin not present. |
| Ce – Insignificant |
Tiny amount of oil or resin present. |
| Ce – Minor |
Less amount of oil or resin present. |
| Ce – Minor – Moderate |
Less to moderate amount of oil or resin present. |
| Ce – moderate |
Moderate amount of oil or resin present. |
| Ce – Significant |
Significant amount of oil or resin present. |
💚 Jadeite Types
| Jade Type |
Treatment Explanation |
| Type A |
**No treatment**. |
| Type B |
**Bleached** with wax or polymer. |
| Type C |
**Dyed** and often bleached. |