Rhodolite

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Rhodolite is a purplish-red to raspberry variety of pyrope-almandine garnet whose name derives from the Greek for rose-colored stone, its hue caused by iron and chromium. It is recovered from alluvial deposits in Tanzania, Zimbabwe, India, and North Carolina, and has become one of the most popular garnets in modern jewelry for its vivid pinkish-red tones. A high refractive index, strong brilliance, and characteristic freedom from visible inclusions make rhodolite a highly desirable gem, while its Mohs hardness of 7 to 7.5 supports regular wear. As a natural, untreated garnet, it owes its color entirely to its composition. Crystallizing in the isometric system with a refractive index near 1.76 and a specific gravity of about 3.84, rhodolite is most often faceted to showcase its brilliance.

Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 7,0 – 7,5

Specific Gravity 3,84

Refractive Index 1,76

Crystal System Isometric

Color various

Mohs Hardness

Mohs Hardness: 7,0 – 7,5

1 Soft10 Hard

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Rhodolite

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

Links may earn a commission at no extra cost to you.

Treatments

This material is reported by G.V. Rogers (unpublished observation) to change from purplish color to a hessonite-type brownish color on heating. A brief check confirmed this change at about 600�C in some rhodolites, but not in others; it could not be reversed by gamma irradiation � Nassau (1984) 7 to 7.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 3.84 +/-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 1.760 +/-Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references IsotropicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Anomalous double refraction Red, brownish-red, violet-redUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) (Dark) redHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Reddish purple, Fe2+ in distorted cubic coordinationW. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011) TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) IsometricHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Orientied rutile needles, apatite, undulatory extinction - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 25 Rhodolite information at mindat.org Kenya  Barot (1993) Mozambique  J. Marques (2009) Sri Lanka  G. Zoysa (2009)

About Rhodolite

La rodolita es una atractiva variedad de granate piropo-almandino de color rojo violáceo a frambuesa, cuyo nombre deriva del griego para «piedra de color rosa», y cuyo color está producido por el hierro y el cromo. Se halla en depósitos aluviales de Tanzania, Zimbabwe, India y Carolina del Norte (EE. UU.), y se ha convertido en una de las variedades de granate más populares en la joyería moderna gracias a sus vívidos tonos rosado-rojos. El excelente brillo de la rodolita, su alto índice de refracción y la ausencia de inclusiones visibles la convierten en una gema muy deseable.