US2007079752A1PendingUtilityA1

Coloured diamond

58
Individually held — no corporate assignee on recordPriority: Sep 6, 2002Filed: Dec 14, 2006Published: Apr 12, 2007
Est. expirySep 6, 2022(expired)· nominal 20-yr term from priority
Inventors:Daniel James TwitchenPhilip Maurice MartineauGeoffrey Alan Scarsbrook
C30B 33/02C30B 29/04C30B 33/00C01B 32/28Y10T428/2982
58
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Claims

Abstract

A method of producing a single crystal CVD diamond of a desired colour which includes the steps of providing single crystal CVD diamond which is coloured and heat treating the diamond under conditions suitable to produce the desired colour. Colours which may be produced are, for example, in the pink-green range.

Claims

exact text as granted — not AI-modified
1 . A method of producing single crystal CVD diamond of a desired colour includes the steps of providing single crystal CVD diamond which is coloured and heat treating the diamond under conditions suitable to produce the desired colour.  
   
   
       2 . A method according to  claim 1  wherein the single crystal CVD diamond is in the form of a layer.  
   
   
       3 . A method according to  claim 2  wherein the layer of single crystal CVD diamond has a thickness of greater than 1 mm.  
   
   
       4 . A method according to  claim 3  wherein the single crystal CVD diamond layer has a uniform crystal quality through its thickness.  
   
   
       5 . A method according to  claim 2  wherein the single crystal CVD diamond is in the form of a piece of the layer.  
   
   
       6 . A method according to  claim 5  wherein the piece of single crystal CVD diamond is a gemstone.  
   
   
       7 . A method according to  claim 6  wherein the gemstone has three orthogonal dimensions, each dimension exceeding 1 mm.  
   
   
       8 . A method according to  claim 1  wherein the single crystal CVD diamond has a concentration of nitrogen in the solid diamond of 0.05-50 ppm.  
   
   
       9 . A method according to  claim 8  wherein the lower limit of the range is 0.1 ppm.  
   
   
       10 . A method according to  claim 8  wherein the lower limit of the range is 0.2 ppm.  
   
   
       11 . A method according to  claim 8  wherein the lower limit of the range is 0.3 ppm.  
   
   
       12 . A method according to  claim 8  wherein the upper limit of the range is 30 ppm.  
   
   
       13 . A method according to  claim 8  wherein the upper limit of the range is 20 ppm.  
   
   
       14 . A method according to  claim 8  wherein the upper limit of the range is 10 ppm.  
   
   
       15 . A method according to  claim 1  wherein the CVD diamond is produced in a synthesis method using a gas phase in which the nitrogen concentration is in the range 0.5 ppm-500 ppm.  
   
   
       16 . A method according to  claim 15  wherein the nitrogen concentration in the gas phase is in the range 1 ppm-100 ppm.  
   
   
       17 . A method according to  claim 15  wherein the nitrogen concentration in the gas phase is in the range 2 ppm-30 ppm.  
   
   
       18 . A method according to  claim 1  in which the dominant colour of the CVD diamond after heat treatment is other than brown.  
   
   
       19 . A method according to  claim 1  in which the colour of the CVD diamond after heat treatment is in the range pink-green.  
   
   
       20 . A method according to  claim 19  in which the colour of the CVD diamond after heat treatment is pink.

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