FALSE DIAMONDS.
It is stated that artificially coloured Cape diamonds have been sold lately in Belgium. Mr Guillot, a French chemist, finds out that on being dipped in a weak aniline solution the diamonds lose their yellowish tinge, and appear as pure white as the Indian or Brazilian stone. The aniline can neither be seen by a magnifying glass nor rubbed off’ with a chamois leather ; so Mr Guillot thinks that the dye must lodgein thesharp angle of the facet which remains unpolished and so affect the light as it falls on the flat surface. A bath of nitric acid will show the fraud, or a little alcohol, which Mr Guillot recommends diamond merchants to use for testing.
Permanent link to this item
https://paperspast.natlib.govt.nz/periodicals/NZGRAP18920312.2.13
Bibliographic details
New Zealand Graphic, Volume IX, Issue 11, 12 March 1892, Page 248
Word Count
118FALSE DIAMONDS. New Zealand Graphic, Volume IX, Issue 11, 12 March 1892, Page 248
Using This Item
See our copyright guide for information on how you may use this title.
Acknowledgements
This material was digitised in partnership with Auckland Libraries. You can find high resolution images on Kura Heritage Collections Online.