What jadeite actually is
Jadeite is a sodium aluminum silicate of the clinopyroxene group, formula NaAlSi₂O₆, and one of two distinct minerals commercially marketed under the trade name "jade"[IMA][GIA]. The other is nephrite, a calcium-magnesium amphibole with chemistry and texture that share none of jadeite's pyroxene character. Both have served interchangeably under the "jade" name across Olmec, Aztec, Maya, and Chinese imperial usage, but they are mineralogically separate species, and jadeite is the species treated here[USGS][IGS]. The jadeite-versus-nephrite distinction is the single most important taxonomy point in the trade. Imperial Green color and the high-pressure metamorphic origin chemistry are jadeite-only, while nephrite carries its own slightly higher toughness and softer color palette.
Jadeite crystallizes in the monoclinic system, but the gemological habit is unique among the catalog's monoclinic species: jadeite forms massive aggregates of microcrystalline interlocking grains rather than discrete single crystals[IGS]. Kunzite and moonstone are also monoclinic but show prismatic single-crystal habit. Jadeite's aggregate texture is the source of its exceptional toughness. Interlocking grain boundaries dissipate impact energy across the matrix, granting jadeite a toughness rating that exceeds diamond's impact resistance[GIA][USGS]. Mohs hardness 6.5 to 7 is moderate. Toughness, the resistance to chipping and fracture under impact, is exceptional. Refractive index 1.652–1.688, specific gravity 3.30–3.38, splintery fracture (consequence of the aggregate texture), and a subvitreous to greasy luster, the trademark "fat" appearance of fine Imperial material, complete the optical fingerprint[IGS]. Single-crystal jadeite has perfect prismatic cleavage, but the microcrystalline aggregate masks it. Finished gems show no observable cleavage planes.
Color chemistry
Jadeite ranges across Imperial Green, Green, Lavender (Purple), Ice (Colorless), White, Yellow, and Black. The seven-color taxonomy is wider than most catalog species[GIA]. Imperial Green is the apex value tier: chromium-rich domains within the aggregate produce a saturated grass-green to emerald-green coloration with high translucency, defined commercially since 19th-century Qing imperial collecting[IGS][GRS]. The Chinese trade term cui describes pure imperial green balanced between blue and yellow hues, distinct from emerald's blue-green.
The Imperial Green trade definition rests on three constraints, Myanmar origin, Type A untreated material, and high translucency (Transparent to Translucent). Together they encode roughly three centuries of trade recognition[GRS][Lotus].
Iron drives the apple-green to yellow undertones and the brown body tones, manganese drives lavender (purple) coloration, titanium-iron complexes drive the dark green-to-black range, and the absence of chromophore produces Ice (Colorless) jadeite, the high-water transparent material whose value rests on optical clarity rather than hue[GIA][IGS]. Transparency is the single steepest value driver in jadeite, reflecting how the trade prices "water", with fully transparent material commanding a dramatic premium over translucent and opaque stones. The ICE jadeite high-water tier commands premium independently of color hue[GRS].
Origin science
Jadeite forms in high-pressure low-temperature metamorphic environments, subduction-zone settings where sodium-rich fluids percolate through aluminum-bearing host rocks at depths of tens of kilometers[USGS]. The three commercial origins are separated by tectonic context. Myanmar, specifically the Hpakant deposits in Kachin State, is the global trade signature for Imperial Green jadeite and has supplied the Chinese imperial market since at least the 18th century[Lotus][SSEF]. The Hpakant high-pressure metamorphic environment produces the chromium-rich saturated green that the trade locks to this origin alone.
Guatemala, the Motagua Valley deposits, is the second commercial source and supplies a wider color range than Myanmar, including the lavender, black, and ice variants. The Motagua jadeite carries Olmec and Mayan archaeological heritage that long predates European contact with the material[USGS][GIA]. Russia, the Polar Urals, is a minor commercial source producing predominantly green material at the lower volume end of the trade[IGS]. SSEF, GIA, and Mason Kay origin reports separate the three sources via inclusion microscopy, trace-element chemistry, and isotope signature. The Hpakant fingerprint carries decisive certificate weight in the Imperial Green market[SSEF][Gübelin].
Treatment landscape: the Type A / B / C disclosure system
The jadeite trade operates under the most consequential treatment-disclosure system in colored gemstones, codified by GIA, the Gem and Jewelry Institute of Thailand (GIT), Hong Kong Institute of Gemology (HKIG), Mason Kay, and SSEF[GIA][LMHC]. Type A is natural untreated jadeite (with at most a surface wax coating). Fine jadeite valuation rests on Type A exclusively because it is the only investment-grade tier and the only category where origin and color premium translate to durable value[CIBJO].
Type B is acid-bleached and polymer-impregnated material: the rough is soaked in acid to dissolve iron oxide impurities and improve apparent color, then impregnated with epoxy or paraffin polymer to fill the resulting microporosity and restore optical continuity[GIA][Gem-A]. The polymer impregnation drastically reduces toughness. Type B stones are vulnerable to chipping and the polymer can yellow, crack, or break down with age. Type B material trades at approximately 5–10% of equivalent Type A value[IGS]. Type C is dyed jadeite, often combined with Type B as the "B+C" treatment, polymer impregnation followed by green or lavender dye injection. Type B and Type C together encompass the bulk of inexpensive jadeite jewelry in retail commerce.
The visual distinction between fine Type A and skilled Type B+C is essentially impossible by eye. A $50,000 Type A Imperial Green stone and a $500 Type B+C imitation can present identically across face, color, and translucency[GIA]. Lab-report verification is the single non-negotiable buyer requirement: GIA, GIT, SSEF, HKIG, and Mason Kay provide the diagnostic infrared spectroscopy, ultraviolet fluorescence (Type B polymer shows characteristic blue-white fluorescence under longwave UV), and microscopic examination required to separate the categories[SSEF][Gem-A]. CIBJO, AGTA, and LMHC trade standards make Type A / B / C disclosure mandatory at every point of sale[CIBJO][AGTA].
Phenomena science
No optical phenomena are documented in jadeite per IGS Properties: no chatoyancy, no asterism, no color-change, no play-of-color[IGS][GIA]. The species' commercial differentiation rests entirely on the three non-phenomenon axes: color saturation (Imperial Green chromium chromophore at the apex through the lavender-manganese, ice-colorless, and black-titanium-iron tiers below), transparency (the trade "water" or "ice" grading from the high-water Transparent tier through the dominant Translucent commercial range to Opaque), and treatment classification (the Type A / B / C disclosure system that governs the entire value chain).
The aggregate microcrystalline texture itself is the species' optical signature. The slightly cloudy "fat" or "greasy" luster of fine Imperial jadeite is diagnostic and recognized in the trade as a positive identification feature, and is the closest jadeite comes to a phenomenon in the conventional sense[IGS]. The same aggregate texture is the structural source of the species' exceptional toughness, interlocking grain boundaries that ancient Olmec, Maya, and Chinese imperial cultures recognized through tool and ritual-object use millennia before mineralogy formalized the property[USGS].
Species identity synthesized from the authoritative sources cited below.