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  • 10 Practical Uses
  • Overview
    • Overview pg 2- Diamagnetic (non-magnetic) Gems
    • Overview pg 3- Factors that Affect Magnetism
    • Overview pg 4- The Magnetic Metals that Color Gems
    • Overview pg 5- Spectroscopy in Relation to Magnetism
    • Overview pg 6- Fluorescene in Relation to Magnetism
    • Overview pg 7- Quantitative Measurements of Magnetism
  • How To Use a Magnet
    • How To pg 2- Floatation Method and Direct Method
    • How To pg 3- Factors That Affect Magnetic Responses
    • How To pg 4- Translucent and Opaque Gems that Pick Up
    • How To pg 5- Separating Look-alike Gems
    • How To pg 6- Magnetic Separation Chart for Look-alike Gems
  • Diamond
  • Sapphire & Ruby
    • Sapphire & Ruby pg 2- Ruby
  • Spinel
    • Spinel pg 2- Red Spinel, Pink Spinel & Other Colors
    • Spinel pg 3- Synthetic Spinel
  • Tourmaline
    • Tourmaline pg 2- Black, Orange, Blue, Green Tourmalines
    • Tourmalines pg 3- Pink, Red, Yellow and Other Colors
    • Tourmalines pg 4- Paraiba Tourmalines
  • Garnet
    • Garnet pg 2- Understanding Garnets through Magnetism
    • Garnet pg 3- How Magnetic Are Garnets?
    • Garnet pg 4- A Rainbow of Color in Garnets
    • Garnet pg 5- A Graph of All Gem Garnets
      • 1958 Winchell Diagram
    • Garnet pg 6- Pyralspite Garnets: Almandine, Pyrope & Spessartine
    • Garnet pg 7- Color Change Garnet
    • Garnet pg 8- Malaya Garnet
    • Garnet pg 9- Pastel Pyrope: A New Variety
    • Garnet pg 10- Rhodolite & Chrome Pyrope
    • Garnet pg 11- Ugrandite Garnets: Andradite & Uvarovite
    • Garnet pg 12- Ugrandite Garnets: Grossular Garnet
    • Garnet pg 13- Distinguishing Between Garnet Species and Varieites
    • Garnets pg 14- Synthetic Garnets
    • Garnet pg 15- Gem Garnet Classification System
  • Axinite
    • Axinite pg 2- Ferroaxinite & Manganaxinite
    • Axinite pg 3- Magnesioaxinite, Tinzenite, Questions of Color
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  • Magnetic Susc. Index
    • Magnetic Index pg. 2- About the Magnetic Susceptibility Index
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© Kirk Feral 2011, All Rights Reserved. These materials may be duplicated for educational purposes only. No part of this website may be duplicated or distributed for profit, for commercial purposes, or for posting to another website without the expressed written consent of the copyright holder.

How Magnetic Are Garnets?


Red Almandine Garnets can be 100 times more magnetic than red Spinels, red Rubies and other weakly magnetic allochromatic gems that may appear similar to Almandine. Among Garnet species and varieties, magnetic susceptibility varies greatly, depending on the amount of iron and/or manganese within the Garnet. The green Mali Grossular Garnet pictured below left looks similar to the green Hydrogrossular on the right, but the Mali Garnet is much more magnetic due to higher iron (Fe3+) content.

Relative Magnetic Susceptibilities of Garnets

Garnet Magnetism

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The bar graph below compares the degree of magnetic attraction (magnetic susceptibility) of most gem Garnet species and varieties in relation to each other. Garnets are presented from least magnetic to most magnetic. The height of each colored bar represents the median measured magnetic susceptibility for the species or variety. The color of each bar corresponds to graph point colors for species and varieties on the All Gem Garnet Graph on page 5.

This bar graph shows that Grossular Garnets (Leuco, Rosolite, Tsavorite, Hessonite, Mali) are the least magnetic Garnets. Spessartine is the most magnetic species, followed by Andradite and Almandine. The least magnetic variety among Pyralspite Garnets is Chrome Pyrope.

Chrome Mali Garnet

Drag Response

Chrome Hydrogrossular Garnet

Moderate Magnetic Response

Magnetism in Gemstones
An Effective Tool and Method for Gem Identification
© Kirk Feral