Denevan crystal
A Denevan crystal was a gemstone from Deneva.

In 2374, Quark acquired fifteen cases of (allegedly) stolen Denevan crystals, which he sold to a Nausicaan entrepreneur for two hundred bars of gold-pressed latinum. Odo was aware of the deal but allowed Quark to proceed, as Quark's attempts to manipulate Odo into leaving station security for a night actually helped him in arranging his anniversary celebration with Kira Nerys. ()

External link 
 

Gemstones