I design and hand-fabricate all the jewelry you see in my portfolio.  I try to use as few commercially available components, preferring to make my own pieces, although I do use so-called Bali spacers a lot.  In general, I use AA or AAA quality stones and beads (all stones and beads are graded; the grades go from AAA, when available, to D).  Nearly all stones and beads are treated or dyed; I use natural material although the cost is higher.  I indicate when the material is treated or dyed; if there is no notation, the material is natural.  Bear in mind that natural material will have shadings or other colorations.  My preferred stringing medium is silk which I have collected, over the years, in a wide array of colors.