Red gemstones, sorted A–Z
Stone Mohs hardness Variety of
Alexandrite 8.5 chrysoberyl
Carnelian 6.5–7 chalcedony
Coral 3–4
Garnet 6.5–7.5
Hematite 5–6.5
Hyacinth 6–7.5 zircon
Jasper 6.5–7 chalcedony
Ruby 9 corundum
Sardonyx 6.5–7 chalcedony
Spinel 8
Sunstone 6–6.5 plagioclase feldspar