Two-sided triangle thingies!

Still on my geometric phase, I recently completed a necklace featuring a chain of nine two-sided triangles (I'm sure there's a mathematical name for that but it eludes me!).  I've always liked featuring black in my designs particularly as a background colour as it seems to make the colours more intense.
The necklace is one complete piece of beading - no joins - just increasing and decreasing at regular intervals. To add some interest I off set each new triangle making them sit at an angle to each other.
Hope you like...