Personal - Scriptures

Today, my unit was merged (well, it was more of a hostile takeover) with another one, changing my boss'-boss'-boss'-boss' boss (I counted twice). It does not influence me even slightly, but we had to stand on parade for an hour and listen to boring speeches. I understand similar things happen in the real world, but this was with attention! and at-ease! each time the speaker changed. Urgh. Anyway, what the merger did change is the unit's name. Now instead of a cryptic acronym we have an appropriately biblical name (it all has to do with the brass' political views). It's a gemstone that appears on the high priest's breastplate. I have tried to identify it, but failed. This is what I have turned up (using links from a wikipedia article). Any suggestions? Edit: This and this reach the same conclusion: nobody knows what it was, but it was probably sparkly.