15 x 15 mm, blue-green and grey.  This is Chinese turquoise.

37 x 18 mm, highly polished front and back with opaque/translucent swirls, rough on the edges, and lined with shimmering crystals.

27 x 20 mm, pale green with some shimmer.

32 x 26 mm, swirls of semi-chatoyant blue with some semi-translucent white (which is much less apparent on the stone in person than it is in this picture).  Found only in Russia.

30 x 16 mm, a mix of translucent and opaque tree-like whorls. 

36 x 17 mm, shimmering feathers of green and silver.  This particular one has more dark green in it than most seraphinite I've seen, and it's one of my favorites. From Russia.

43 x 18 mm, intricate whorls of green and brown with some translucence woven in. 

20 x 15 mm, a very deep blue for this form of jasper, I'm fairly sure it's been dyed.  Very striking.

32 x 27 mm, turquoise colors with brown.  Mined in the US.