Read it through once

These artists will take particles of stone or glass no larger than a mustard seed, and piece them together on a sleeve button or a shirt stud, so smoothly and with such nice adjustment of the delicate shades of color the pieces bear, as to form a pigmy rose with stem, thorn, leaves, petals complete, and all as softly and as truthfully tinted as though Nature had builded it herself. They will counterfeit a fly, or a high-toned bug, or the ruined Coliseum, within the cramped circle of a breastpin, and do it so deftly and so neatly that any man might think a master painted it.