COMPARE GUIDE
Dyed HowliteVSLapis Lazuli
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
Decisive distinctionsDECISIVE
- ◎ is higher in Dyed Howlite, giving a numerical distinguishing point.
- ◎ is higher in Lapis Lazuli, giving a numerical distinguishing point.
Note: properties whose numeric ranges do not overlap are auto-extracted. Both are measurable with a refractometer or heavy-liquid bath.
Physical propertiesPROPERTIES
| Property | A: Dyed Howlite | B: Lapis Lazuli | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.586–1.605 | 1.500–1.520 | A higher |
| Specific gravity (SG) | 2.45–2.59 | 2.50–3.00 | Overlap |
| Mohs hardness | 3.5 | 5.5 | B higher |
| Birefringence | 0.022 | — | — |
| Dispersion | — | — | — |
Optics & fluorescenceOPTICS & UV
| Property | A: Dyed Howlite | B: Lapis Lazuli |
|---|---|---|
| Crystal system | 単斜晶系 | 等軸晶系（多鉱物） |
| Pleochroism | — | — |
| Chelsea filter | — | — |
| UV (long-wave) | — | — |
| UV (short-wave) | inert | weak (white) |
ObservationOBSERVATION
◆abochons at $1–$10 per piece.
Color categoriesCATEGORIES
A: Dyed Howlite
Blue
B: Lapis Lazuli
Blue
DISTINGUISHING TOOLS · 3 ITEMS
Distinguishing tools
Tools that decide between Dyed Howlite and Lapis Lazuli in practice.
Note: this page is auto-generated from published GIA / CGL reference values. Individual stones, treatments, and synthetics may fall outside these ranges. For a definitive identification, consult an accredited gem laboratory.