Article Topic: Investigation of channel etches with the appearance of laser drilling.

Gem Material: Diamond
Author: Ronnie Bauer and Chris Payne
Abstract from Article:
‘The internal look of the etched channel shows the normal striations that you would expect to see on the surface of a diamond crystal. Another distinguishing feature between an etching channel and a laser drill channel is that an etching channel may not be straight and follow the cleavage plans of the crystal.’

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Article Topic: Discussing the pro’s and con’s of laser inscribing and an overview of the process of laser inscribing diamonds.

Gem Material: Diamond
Author: Ronnie Bauer
Abstract from Article:
‘The process of inscribing a logo, message or a series of numbers on the girdle of a diamond is only limited by the diameter and quality of the girdle. In reality, only two things are usually inscribed: the logo of the grading lab and the certificate number. However we have had instances where the branding of a diamond is important to the retailer so in addition  the store’s logo or less often love messages.’

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Article Topic: Investigation into the cause of colouration difference of four white diamonds.

Gem Material: Diamond
Authors: Ronnie Bauer and Chris Payne
Abstract from Article:
‘ If the colouration was the result of a trace element (in the same circumstances as Boron causes blue colouration in diamonds) then the diamond should have appeared transparent rather than translucent. The diamond had an even adamantine luster, and shadowed surface-incident illumination failed to show any surface reaching structures that could account for the colour the diamond displayed being caused by an inclusion.’

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Article Topic: Investigation into the cause of colouration difference between two African blue/grey/green diamonds.

Gem Material: Diamond
Authors: Ronnie Bauer and Chris Payne
Abstract from Article:
‘All the areas of original crystal surface had numerous green patches (fig 9) which were identical in appearance with those described in Gems & Gemmology, Vol. 40, No. 2, 2004, pp. 163-164. This would then indicate that the source of the green patches was also due to radioactivity, from burning caused by radioactive minerals in the surrounding country rock in contact with the diamond.’

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