gemology, ruby a precious gemstone and a variety of the mineral corundum, prized for its vivid red color, vintage illustration - corundum stock illustrationsGemology, Ruby a precious gemstone and a variety of the mineral corundum, prized for its vivid red color, Vintage illustration
various crystal shapes of gemstones, wood engraving, published in 1893 - corundum stock illustrationsVarious crystal shapes of gemstones, wood engraving, published in 1893
