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Ruby in Marble

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Rubies in marble, also referred to as marble-hosted rubies, are considered higher quality compared to rubies formed in basaltic rocks. This is because the low iron content in marble allows rubies to develop a more intense red color. Ruby has the chemical formula Al₂O₃, while marble commonly has the formula CaCO₃ or CaMg(CO₃)₂. Under ultraviolet light, ruby fluoresces a bright red-pink color. This particular ruby is unpolished.

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  • 4.5 cm W x 22.5 cm H x 4.5 cm L
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Science History Institute. Ruby in Marble. Photograph, 2025. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/rrdmfvh.

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The Science History Institute recognizes there are materials in our collections that may be offensive or harmful, containing racist, sexist, Eurocentric, ableist, or homophobic language or depictions. The history of science is not exempt from beliefs or practices harmful to traditionally marginalized groups. The Institute is engaged in ongoing efforts to responsibly present and address the evidence of oppression and injustice inextricable from the history of science. If you would like to learn more about our ongoing efforts or if you encounter harmful, inaccurate, or insufficient descriptions, please contact us at digital@sciencehistory.org.