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 of Rhodolite shown against the ten reference minerals, from talc (1) to diamond (10).

Mohs	Reference mineral	Rhodolite
1	Talc
2	Gypsum
3	Calcite
4	Fluorite
5	Apatite
6	Orthoclase
7	Quartz	●
8	Topaz
9	Corundum
10	Diamond

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This material is reported by G.V. Rogers (unpublished observation) to change from purplish color to a hessonite-type brownish color on heating.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

ロードライトは、紫みのある赤〜ラズベリー色のパイロープ・アルマンジン系ガーネットで、ギリシャ語の「バラ色の石」に由来し、鉄とクロムによる発色が特徴です。タンザニア・ジンバブエ・インド・米国ノースカロライナ州の沖積土砂から産出し、鮮やかなピンク赤色が現代ジュエリーで最も人気のガーネット変種の一つとなっています。高い屈折率による優れた輝き・内包物の少なさが宝石としての魅力を高めています。