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What is the name of the type of window with diamond shaped glass in it, to make it look medieval??
I believe you are referring to a Lancet window. They are usually tall, and narrow with a pointed-arch top, often with leaded diamond shaped lights, I've come across a few in my construction days. Unfortunately people replace the broken or missing lights with lexan, a form of plastic.
From Wikipedia: A lancet window is a tall narrow window with a pointed arch at its top[1] It acquired the "lancet" name from its resemblance to a lance.[2] Instances of this architectural motif are most often found in Gothic and ecclesiastical structures, where they are often placed singularly or in pairs. The motif first appeared in the French early-Gothic period (c.1140-1200) and later in the English period of Gothic architecture (1200-1275), so common was the lancet window feature that this era is sometimes known as the "Lancet Period".[3] Strictly speaking the lancet window should be austere and without tracery.[4] However, it is not uncommon to find the form sub-divided and filled with stained glass, especially when dating from the Gothic-revival period of the nineteenth century.