• 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
1. The P can distinguish natural blue diamonds from synthetic ones in cheap and easy way
2. In blue diamond, P phenomenon is normal via slowly releasing a substance in the dark. After exposure to light, these diamonds will shine in different color from blue to fiery red. For an 45.52 carat diamond, the light can remain as long as a minute.
3. Describing an opportunity to do further research on various diamond under 20 seconds ultraviolet light.
4. Reddish P is rare in diamond. The two wavelengths decide the final glow.
Neither the synthetic stones nor the color enhanced gray stone glowed at the 660nm wavelength. The rationale has been used to idenfication