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- 2015-6-27
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- 1970-1-1
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• Pho-: distinguish natural blue diamonds from synthetic ones
• Process: energy previouly absorbed→ release
○ Blue diamond
§ exposure to light
§ Glow in colors
□ e.g. 45.53-carat Hope diamond: orange-red glow
• 2005 Aurora Heart collection : on loan
○ Researchers:
§ 67natural, 3 systhetic and a gray one
§ Shone ultraviolet light
§ Measure the pho-
□ All natural : glow at 2 wavelengths
® 500-nm
® 660-nm
□ Provide Fingerprint
® synthectic & gray stone:No 660-nm
® Solve big problem
◊ Distinguish the artifiacl ones
◊ Identify the stolen or smaller stones
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