  Leaded glass teardrop. 
33% lead content leaded glass.  That's the highest percentage of lead I could find on eBay: Leaded glass is often identified by how much lead is in it because the more lead, the higher the index of refraction and thus the more sparkle. 
Source: eBay seller originalbuy 
Contributor: Theodore Gray 
Acquired: 11 March, 2009 
Text Updated: 12 March, 2009 
Price: $4 
Size: 1.5" 
Purity: 33%
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