This new triangle shape from Miyuki has sharper edges than the original triangle beads and some of them can be a little bit irregular, similar to the 4x4mm cube bead. It looks like the more recent shipments have corrected the irregular shape, which I think might be a disappointment to the people who were taking advantage of the slightly natural and organic feel of the irregular shape, but pleasing to all the beadweavers and those who enjoy the regularity of Miyuki beads in general.
This necklace has a free pattern on the Miyuki site.
I have been using the Sharp Triangle Beads to edge my bead embroidery, because they fit together beautifully and their slight irregularity helps to hide any uneven places along the edge. You can see them used in my latest Necklace and Bracelet.