Gemmology
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Specimens of gemstones by colour: blue [gallery view]

Hackmanite — specimen 0061
Chalcedony — specimen 0180
Chalcedony — specimen 0510
Chalcedony — specimen 0511
Chalcedony — specimen 0512
Chalcedony — specimen 0580
Chalcedony — specimen 0591
Chalcedony — specimen 0225
Chalcedony — specimen 0418
Chalcedony — specimen 0558
Petschite — specimen 0081
Petschite — specimen 0082
Petschite — specimen 0334
Petschite — specimen 0335
Tanzanite — specimen 0235
Tanzanite — specimen 0363
Tanzanite — specimen 0383
Cordierite — specimen 0025
Cordierite — specimen 0123
Cordierite — specimen 0214

Specimens of gemstones by colour: blue — 28
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