Method for discerning colorless and near colorless diamonds and arrangement for carrying out this method
First Claim
1. Method for qualifying a diamond on the basis of a measured light transmission through the diamond, whereby the diamond is radiated by a light source which emits light having a certain wavelength, and the transmission of said light through the diamond is measured and compared to a reference value which corresponds to the transmission of said light through a reference diamond, characterised in that use is made of a light source which emits light having a wavelength in a range of 225 nm to 300 nm, whereby a cut colourless or near colourless diamond with a concentration of A centres between 7 ppm and 22 ppm is selected as said reference diamond, and whereby the diamond is classified as natural and not colour-treated if the transmission through the diamond is smaller than or equal to said reference value, in particular the transmission through the reference diamond.
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Abstract
The invention concerns a method for qualifying a diamond on the basis of a measured light transmission through the diamond, whereby the diamond is radiated by a light source which emits light having a wavelength in a range of 225 nm to 300 nm, whereby the transmission of said light through the diamond is compared to a reference value which corresponds to the transmission of said light through a reference diamond, which is a cut colourless or near colourless diamond with a concentration of A centers between 7 ppm and 22 ppm, and whereby the diamond is classified as natural and not colour-treated if the transmission through the diamond is smaller than or equal to the reference value.
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15 Claims
- 1. Method for qualifying a diamond on the basis of a measured light transmission through the diamond, whereby the diamond is radiated by a light source which emits light having a certain wavelength, and the transmission of said light through the diamond is measured and compared to a reference value which corresponds to the transmission of said light through a reference diamond, characterised in that use is made of a light source which emits light having a wavelength in a range of 225 nm to 300 nm, whereby a cut colourless or near colourless diamond with a concentration of A centres between 7 ppm and 22 ppm is selected as said reference diamond, and whereby the diamond is classified as natural and not colour-treated if the transmission through the diamond is smaller than or equal to said reference value, in particular the transmission through the reference diamond.
Specification