Figure 1. A limited amount of emeralds have so far been produced from the Fazenda Bonfim region in Brazil’s Rio Grande do Norte State. The faceted stones shown here weigh 1.29–1.92 ct, and the ...
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Pink-to-red coral has a long history as an ornamental gem material in jewelry, carvings, and sculptures. However, due to a variety of environmental and legal factors, the supply of high-quality, ...