Sapphirine Value, Price, and Jewelry Information


sapphirine, silver, and enamel brooch
Sapphirine, silver, and enamel brooch from the Ivan Britsyn workshop, St. Petersburg, Russia, 1908-17. Collection V. Kirichenko. Photo by Shakko. Licensed under CC By-SA 3.0.

Sapphirines are durable but very rare gemstones. Although named after their typically sapphire-blue color, these gems can occur in different hues and display pleochroism, too.

Sapphirine Value

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Sapphirine Value via Gem Price Guide
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Sapphirine Information

DataValue
NameSapphirine
Crystallography Monoclinic or triclinic; crystals tabular; usually granular or as disseminated grains.
Refractive Index 1.701-1.723
Colors Pale blue, bluish gray, greenish gray, green, purplish, brown; depth of blue color varies with Fe. Also, (rarely) purplish pink, red.
Luster Vitreous.
Fracture Uneven to subconchoidal
Hardness 7.5
Specific Gravity 3.4-3.5.
Birefringence 0.006
Cleavage Indistinct
Dispersion 0.019
Luminescence Inert, except for rare red gems. See "Identifying Characteristics" below.
Wearability Very Good
Transparency Translucent to transparent.
Absorption Spectrum Not diagnostic.
Formula

 Mg3.5Al9.0Si1.5O20 (+Fe). Complex substitution of Mg/Al/Si with charge balancing.

Two polytypes:

  • Sapphirine-2M = (Mg,Al)8(Al,Si)6O20; monoclinic.
  • Sapphirine-1Tc = (Mg,Al )8(Al,Si)6O20; triclinic.
Pleochroism Distinct: X = pinkish buff; yellowish; pale smoky brown; colorless: Y = sky blue; sapphire blue; greenish blue; Z = dark sky blue; sapphire blue.
Optics a = 1.714-1.716; β = 1.719-1.721; γ = 1.720-1.723. Biaxial (-). See "Identifying Characteristics" for variations.
EtymologyIn allusion to the stone’s “sapphire blue” color.
OccurrenceIn mineral veins or cavities in eruptive igneous rocks.
sapphirine and muscovite crystals
Sapphirine and mica (var. muscovite) crystals. Beraketa, Bekily Department, Southwestern region, Tuléar Province (Toliara), Madagascar. Photo by Géry Parent. Licensed under CC By-SA 3.0.

Comments

Sapphirine has loaned its name to the sapphirine mineral supergroup, which contains three subgroups, including the sapphirine group.

Even though sapphirines occur in transparent grains, facetable material is exceedingly rare.

Despite its name and most well-known color, sapphirine is a gem species distinct from sapphire. However, like sapphire, it too occurs in more colors than blue, albeit rarely. These colors include shades of violet, purple, green, pink, and brown. In 2007, a red variety was discovered in Tanzania. In addition, sapphirines can show very strong trichroic colors depending on the viewing angle.

oval-cut sapphirine - Sri Lanka
Most rare gem-quality sapphirines are grayish blue. Rarer still are those that show different colors, like this dark brownish, somewhat purple specimen. 1.09 cts, oval brilliant cut, 6.9 x 5.5 mm, Sri Lanka. © The Gem Trader. Used with permission.

“Sapphirine Chalcedony”

The term “sapphirine” has sometimes been applied incorrectly to blue specimens of chalcedony, crystalline quartz, and spinel. One specific usage in art history persists. The gemologist Fred Gray writes that the ancient Greeks created scarab-like seal rings and particularly favored light blue chalcedony. In recent times, this material received the French name of “sapphirine.”

"Sapphirine Chalcedony" - Minoan seal
Although the material is noted correctly as chalcedony in the museum listing, this rectangular prism is still referred to as “sapphirine chalcedony,” after the fashion of describing these antiquities. Minoan civilization, ca. 1900–1600 BCE, 1.65 cm x 0.75 cm x 0.65 cm. Bequest of Richard B. Seager, 1926. Metropolitan Museum of Art, New York. Public Domain.

Identifying Characteristics

Sapphirine’s refractive indices (RI) are close to those of idocrase. However, the former has a biaxial negative optic character. (Please note that idocrase may be anomalously biaxial). Sapphirines also exceed idocrase in specific gravity (SG).

An unusual, 1.54-ct, oval-cut, purplish-pink specimen from Sri Lanka (initially reported as idocrase) had the following properties: 

  • RI = 1.701-1.707 with a β = 1.705.
  • Birefringence = 0.006.
  • SG = 3.51.

The rare red sapphirine from Tanzania reportedly has the following luminescent properties under ultraviolet light (UV):

  • Longwave UV: dull red.
  • Shortwave UV: weak orange.

Serendibite, another rare mineral in the sapphirine supergroup, also occurs very rarely in gem-quality condition. Since the 1990s, faceted serendibites have begun to appear on the market. While sapphirines and serendibites may appear very similar and have overlapping properties, sapphirines usually have higher RIs and hardness.

faceted serendibites - sapphirine mineral supergroup
A matched pair of oval mix-cut serendibites, black to very dark bluish green in strong transmitted light, 3.37-ctw, 6.4 x 8.1 mm, Myanmar. © The Gem Trader. Used with permission.

Synthetics

Scientists have synthesized sapphirines for geological research. However, there is no known jewelry use for this material. 

Enhancements

No known gem treatments.

Sources

Madagascar and Sri Lanka are the principal producers of gem-quality sapphirines.

Other gem-quality sources include the following:

  • United States: Keweenaw Peninsula, Michigan; Lake Superior, Minnesota; Milford, Utah.
  • Australia; Canada; Czech Republic; Greenland; Italy; Japan; South Africa; Sweden; Tanzania; Thailand; Scotland, United Kingdom.

Care

With a hardness of 7.5 and poor or indistinct cleavage, sapphirines would make good stones for everyday jewelry wear, especially if you like their classic blue appearance. Although small, most gem-quality stones are generally eye clean. These gemstones require no special care or cleaning methods.

sapphirine crystal - Madagascar
Indigo-blue sapphirine crystal, 2.1 x 1.9 x 1.4 cm, Anosy (Fort Dauphin) Region, Tulear (Toliara) Province, Madagascar. © Rob Lavinsky, www.iRocks.com. Used with permission.