IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Alizarin, a natural dye derived from ...

Image of the 168-carat emerald, bequeathed by Anna Cast Mackay to the Smithsonian Institution National Gem Collection, in 1984. The stunning Mackay Emerald was mined in Muzo, Colombia, and was placed ...