Parcel of unusual colors of Spessartite Garnets from Tanzania. These were all tested on the office Gemmo Raman - 532 
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6 pieces / 9.645 grams / 48.225 carats / 8+ carats average / clean save 1 piece that has a little sugar  ⁠
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From ChatGPT: Spessartite garnet is composed primarily of manganese aluminum silicate [(Mn,Fe)3Al2(SiO4)3], where manganese and aluminum ions replace some of the iron and silicon ions in the crystal structure. The exact composition can vary slightly, with some specimens containing more iron (resulting in a redder color) and others containing more manganese (resulting in an orange to orange-red color). It's the manganese content that gives spessartite garnet its distinctive orange color. Additionally, spessartite garnet can contain trace elements such as calcium, magnesium, and titanium, which can influence its color and appearance.