Lapis Lazuli

Key Differentiators

• Intense blue color
• Presence of golden pyrite flecks
• Aggregate rock, not a single mineral

Natural vs. Synthetic

Synthetic lapis lazuli is commercially available (Gilson synthetic (Bourgogne Lapis)). Distinguishing natural from synthetic typically requires microscopic examination of internal features.

• Visual / magnification: Irregular, varied blue saturation with white calcite patches and randomly distributed brass-yellow metallic pyrite flecks of varying size. Granular, slightly uneven surface texture. Synthetic: Gilson: too-uniform intense blue, no natural color variation, pyrite absent or too evenly distributed as fine brassy dust, calcite absent or as uniform specks, 'waxy' or 'sugary' even texture under magnification.
• Acetone test: No reaction — cotton swab stays clean, surface unchanged. Synthetic: Gilson synthetic: slight blue color transfer to swab, surface may become slightly sticky or dull.
• Glass imitation: Natural lapis has sub-vitreous luster, granular texture, pyrite and calcite. Synthetic: Glass: higher vitreous luster, perfectly smooth surface, no texture, gas bubbles under magnification, conchoidal fracture on chip, cold to touch.

Commonly Confused With

Commonly confused with: Dyed Sodalite, Agate, Sodalite.

Treatments

• Dyed (to intensify or fake quality)
• Wax or oil impregnation
• Simulated (dyed howlite, sodalite, synthetic)

Price Context

Price context is approximate. GemID is not an appraisal tool. Results are indicators, not certified valuations.

Measurement Guides

How to Identify a GemstoneHow to Measure Specific GravityHow to Use a RefractometerUV Fluorescence Testing