Distinguishing natural from synthetic diamond

Details Distinguishing natural from synthetic diamond Distinguishing natural from synthetic diamond

G - Physics

01

N

G01N 21/87 (2006.01)

Patent

CA 2198842

In order to provide a simple, safe and compact apparatus for distinguishing natural colourless or near-colourless diamond from synthetic diamond, an apparatus has a chamber (2) in which a flash lamp (4) irradiates a stationary diamond (7) with irradiation which has a substantial component of ultraviolet light below 250 nm or 225 nm. The intensity of phosphorescence emitted by the diamond (7) after irradiation by the lamp (4) is measured by a photomultiplier tube (9), which gives a signal to a microprocessor. There is a visual display (13) of the elapsed time for the phosphorescence intensity to decrease to a threshold value. The diamond (7) is classified as probably natural if it has no phosphorescence, or a short phosphorescence time.

Un appareil simple, sûr et compact, qui permet de distinguer un diamant naturel incolore ou quasiment incolore d'un diamant synthétique, comporte une chambre (2) où une lampe flash (4) expose un diamant fixe (7) à un rayonnement comportant une composante substantielle de lumière ultraviolette inférieure à 250 ou 225 nm. L'intensité de la phosphorescence émise par le diamant (7) après cette irradiation est mesurée avec un tube photomultiplicateur (9) qui envoie un signal à un microprocesseur. Un affichage (13) indique le temps écoulé jusqu'à ce que l'intensité de phosphorescence s'abaisse à une valeur de seuil. Le diamant (7) est considéré comme probablement naturel s'il ne présente aucune phosphorescence ou une durée de phosphorescence brève.

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