Tiffany Studios is most famous for leaded glass lamps, but they produced lamps with hand-blown shades, called Favrile glass shades. Most of them are similar in shape (domical) and decoration (wave decoration). They fit into harp lamps or counterbalance lamps, either in table or floor versions. Most of the available supply are gold decorated, with green decorated shades being a bit rarer, followed by blue shades (rare) and finally red shades (extremely rare).
Occasionally the shades were blown with a flaw, such as an air bubble or an impurity. Tiffany Studios made lemonade with these lemons, by hand-carving an insect over the defect. The flaw would become the body of the insect. Even though these shades were originally flawed, they are now worth a premium because of the added insect.
On rarer occasions, perfect shades were more intricately carved with leaf and vine decoration or insects. The carving adds significant rarity and therefore, value, to them.
So to sum up, an undecorated shade is the least valuable, then a decorated shade. Then comes the color, with the rarer colors worth more. Then comes added details, like carving, adding still more value. If one could find a red decorated shade with wheel-carving of insects, that would be something really special. In all my experience, I’ve never seen one, but I sure would love to.
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