Apatite is becoming a favorite stone of mine. Here we have faceted rondelles - very different from the coins and that's the beauty when working with natural stones.  Again, the cut  gives these beauties a shine that's hard to miss. 
 
Fun Fact: The name Apatite is derived from a Greek word meaning "to deceive" because the variety of colors and formations in which this stone occurs makes it easy to mistake for other minerals. It may be yellow, blue, green, brown, gray or colorless, but the Apatite stones used for metaphysical purposes are primarily higher-quality crystal pieces in blue, green and gold.
Source: Robert Simmons & Naisha Ahsian, The Book of Stones (Berkley, CA: North Atlantic Books, 2007)
 
Details:
Length: 2 inch
Apatite rondelle stones
Sterling silver metals