Book excerpt: Opals emit a rainbow of colors, which makes them perfect gems to place in stunning pieces of jewelry. How do opals go from raw stones to beautiful gems? Readers discover the answer to this question as they learn the steps that must be taken and the technology that is used to find, cut, and polish opals. Clear main text and informative fact boxes help readers become experts on opals. Colorful photographs of these gems are sure to keep readers engaged as they learn.