Online samples of two articles from The Journal of Gemmology, 2008, 31(1/2) can be seen here.

These two articles are:
‘Thortveitite — a new gemstone’ by R, Chapman, I.F. Mercer, A.H. Rankin and J. Spratt (pp 1-6)
and
‘Visualization of the internal structures of cultured pearls by computerized X-ray microtomography’ by U. Wehrmeister, H. Goetz, D.E. Jacob, A. Soldati, W. Xu, H. Duschner and W. Hofmeister (pp 15-21).