  Strontium Titanate fake diamond.  
Before the widespread use of cubic zirconia as fake diamond, strontium titanate was more popular. It is, however, much softer than diamond, and much more expensive that cubic zirconia. 
I like it because it's a pretty use of strontium. 
Source: Theodore Gray 
Contributor: Theodore Gray 
Acquired: 11 March, 2009 
Text Updated: 12 March, 2009 
Price: $20 
Size: 0.25" 
Composition: SrTiO3
 |  
  |  
 |  
  |