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===Fracture filling=== [[File:Emerald Fracture Filled Rainbow.jpg|thumb|alt=The foreign material inside this fracture-filled emerald appears rainbow-colored under darkfield illumination.|The foreign material inside this fracture-filled emerald appears rainbow-colored under darkfield illumination.]] Fracture filling has been in use with different gemstones such as diamonds, emeralds, and sapphires. In 2006 "glass-filled rubies" received publicity. Rubies over 10 carats (2 g) with large fractures were filled with lead glass, thus dramatically improving the appearance (of larger rubies in particular). Such treatments are fairly easy to detect.
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