Wikipedia says: A paperweight is an object designed to hold sheets of paper on a surface to prevent wind from blowing them away. Since this is an issue rarely encountered in modern offices, the term paperweight has taken on an additional connotation for a technical device which, having broken or failed at its original purpose, is now essentially worthless ( I strongly disagree) beyond the value of its physical mass. Purpose-made decorative paperweights are also widely produced and appreciated as pieces of art (rather than their actual use in holding down papers in a breeze), and are often exhibited in museums as examples of fine glass art.
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The Classic Diamond Paperweight
Personalized Paperweights from Red Stamp