Why do untreated Type A Jadeite bangles chime like a clear bell when tapped lightly?

Untreated Type A Jadeite has a dense interlocking pyroxene grain structure with high acoustic Q-factor (low internal damping). Gently suspending a bangle by thread and tapping with agate or another bangle yields a crisp, long-sustaining metallic-crystal ring (~3.0-3.6 kHz), whereas polymer-injected Type B jadeite absorbs vibrations into a flat, dull plastic thud.

What is the exact difference between Type A, Type B, and Type C Jadeite?

Type A is 100% natural, unbleached jadeite (light surface wax allowed). Type B has been soaked in strong hydrochloric/sulfuric acid to dissolve brown iron stains, leaving chalky voids that are vacuum-filled with epoxy/polymer resin. Type C is artificially dyed; Type B+C undergoes acid bleaching, polymer filling, and synthetic dye injection.

How can you separate Nephrite from Jadeite scientifically?

Jadeite (NaAlSi2O6) is a pyroxene with higher specific gravity (3.30-3.38) and Mohs 6.5-7.0. Nephrite is a tremolite-actinolite amphibole with lower SG (2.90-3.03), slightly lower Mohs (6.0-6.5), and felted microscopic fibers giving it the highest fracture toughness of any gem mineral.

Does green fluorescence under 365nm UV always prove a jade bangle is Type B polymer?

Most polymer resins glow chalky blue-white under longwave 365nm UV, making UV a strong screening red flag—however, modern non-fluorescent resins exist, so certified gem labs confirm Type A vs Type B definitively via FTIR spectroscopy (2800-3100 cm-1 C-H polymer peaks).

Tap Two Real Jade Bangles Together & They Sing Like a Temple Bell (Spot Type B/C Fakes!)

Type A Untreated Jadeite: Pure 3,420 Hz Temple Bell Chime (SG 3.34) ⚡ 60 FPS

Click suspended bangles to Tap-Ring acoustics & see live FTIR polymer curve!

Mineral SpeciesNaAlSi₂O₆ · Monoclinic Pyroxene

Acoustic Ring3,420 Hz Crisp Sustain (2.6s)

Authentic Verdict100% Untreated Natural Type A!

⚙️ Tap Strength, Resin Concentration & RI / SG Calibration

Polymer Fill (%)0%

Tap Strike Force72%

365nm UV Intensity0%

Fluid Density Check1.00

🔬 Gemological Forensic Summary

Microstructure PhysicsInterlocking pyroxene crystals allow crisp acoustic wave propagation (2.6s chime).

Common Market ScamAcid-bleached Type B jade glows vivid translucent emerald right after epoxy fill, then yellows in 2–5 years!

Lab ProtocolGIA/NGTC Grade A requires flat FTIR (no 2925/2960 cm⁻¹ C–H polymer peaks) + SG 3.34.

⚖️ Jadeite (SG 3.34) vs. Nephrite (SG 2.95): What Happens If You Drop Both?

Even though Jadeite is slightly harder (`Mohs 6.5–7.0` vs `6.0–6.5`), Nephrite holds the world record among all gemstones for sheer fracture toughness! Its microscopic tremolite fibers weave like felted wool—requiring more hammer energy to shatter a Nephrite boulder than Quartz, Topaz, or even Ruby.

⚡ Quick Buyer Brief: The 4-Step Real Jade Checklist

1. Tap-Ring Acoustics: True un-filled Type A Jadeite rings clearly when suspended; polymer-filled Type B thuds dull. 2. Specific Gravity: `3.34` = Jadeite, `2.95` = Nephrite, `2.65` = Quartzite/Chalcedony fake, `2.55` = soft Serpentine. 3. 660 nm Chelsea / 365 nm UV Check: Chalky blue UV = suspicious resin. 4. FTIR Lab Certificate: The final legal proof of Type A.

📊 Jadeite, Type B/C, Nephrite & Simulant Forensic Table

Stone / Grade	SG & RI	Tap Chime Sound	UV & FTIR Diagnostic
Type A Jadeite (`NaAlSi₂O₆`)	SG `3.34` · RI `1.66`	Clear High Bell (`3.4 kHz`)	Inert under UV · Clean FTIR
Type B Bleached + Epoxy	SG `3.05–3.24`	Dull Plastic Thud	Chalky blue UV · Strong `2925 cm⁻¹` peaks
Type C / B+C Dyed Jadeite	SG `3.05–3.30`	Dull (if B+C)	Dye rings inside fracture spiderwebs (`10x` loupe)
Nephrite (`Ca₂(Mg,Fe)₅...`)	SG `2.95` · RI `1.61`	Warm Medium Ring	Oily-greasy luster · Felted tough fibers
Dyed Quartzite / Aventurine	SG `2.65` · RI `1.54`	Sharp Glassy Clink	Color concentrated in quartz grain boundaries
Serpentine / "New Jade"	SG `2.55` · Mohs `3.5`	Dead Thud	Easily scratched on underside by steel blade!

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