AphroDiamante GmbH
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Synthetic Diamonds
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The synthetic diamonds or in other words "laboratory created" or "cultured" diamonds are real diamonds composed of carbon atoms.

Presently, there are two main methods to produce synthetic diamonds:

  • High pressure high temperature growth on seed (small diamond crystal) by temperature gradient method.
  • Chemical Vapor deposition (CVD) growth.

Rather different growth conditions (pressure, temperature) as well as apparatus design are utilized for above mentioned methods.

Nowadays the technology reached the point when a gem quality stones weighted more than 1-2 ct can be produced by either method.

The color range of as grown synthetic diamonds varies significantly - from colorless (white) to black (dark blue). Also achievable are yellow-orange colors of various combinations, green-yellow and light blue (see Fig. 1).

Physical properties of synthetic diamonds are almost the same of their natural counterparts, whereas gemological properties can give some clues to identify the origin of stones as synthetic. A distinctive feature of most (but not all) synthetic diamonds is the presence of luminescence to SWUV (short wave ultra violet) radiation with consequent phosphorescence (see Fig.2).

Among the most reliable identification techniques to recognize synthetic diamonds are - FTIR (Fourier Transformed Infra Red) spectroscopy, ESP (Electron Spin Resonance), Cathodeluminescence, UV luminescence.

Fig. 1
Fig. 1 A typical color range of synthetic diamonds.
Fig. 2
Fig. 2 The reaction of synthetic diamonds (lumine-scence) to irradiation with SWUV (254 nm). The stone on the left is sheelite - an indicator of SWUV radiation.

Aphrodiamante GmbH has all necessary advanced gemological equipment to identify the synthetic diamond with certainty.

We have direct contacts with other producers of industrial and gem quality synthetic diamonds in Ukraine, Russia, China and USA.

In close cooperation with Vollstaedt Diamant GmbH the quality analyses, sorting and investigation of physical chemical properties of diamonds can be performed.

 
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