What is the Rosser Reeves Ruby?
By Jared James · Last updated 21 May 2026
Definition
The Rosser Reeves Ruby is one of the most celebrated star rubies in the world, weighing 138.7 carats and originating from Sri Lanka. It is famous for its deep, rich red colour and an unusually sharp, well-centred six-rayed star, the asterism caused by intersecting rutile needles inside the stone. The ruby was named after its former owner, American advertising executive Rosser Reeves, who reportedly carried it as a lucky charm. It now belongs to the Smithsonian Institution in Washington, D.C.
Frequently asked questions
- What makes the Rosser Reeves Ruby special?
- It combines exceptional size at 138.7 carats with a vivid, saturated red colour and a remarkably sharp, centred star. Many large star rubies have cloudy colour or a poorly defined asterism; the Rosser Reeves is rare in excelling at both.
- What is a star ruby?
- A star ruby is a ruby that shows asterism, a star-shaped optical effect caused by tiny parallel rutile needles inside the stone reflecting light in intersecting rays. The effect is best seen under a single direct light source. Most star rubies are cut as cabochons so the rounded surface displays the star clearly.
- Where is the Rosser Reeves Ruby now?
- It is part of the National Gem Collection at the Smithsonian Institution's National Museum of Natural History in Washington, D.C., where it is on display alongside other famous gems including the Hope Diamond.
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