Diamond composition

Abstract

One variation of a diamond composition includes carbon: including a first amount of carbon-13 isotopes and a second amount of carbon-12 isotopes; and sourced from a hydrocarbon mixture including hydrocarbons and formed via methanation of a carbon dioxide mixture. The carbon dioxide mixture: sourced from a sample of air including carbon dioxide and impurities; conveyed through a separation unit configured to remove impurities; including carbon dioxide and impurities; conveyed through a distillation column configured to regulate amounts of carbon-13 isotopes and carbon-12 isotopes; and exhibiting a target ratio of carbon-13 isotopes to carbon-12 isotopes at an outlet of the distillation column. The diamond composition: formed via chemical vapor deposition; and exhibiting an isotopic signature defining a final ratio of the first amount of carbon-13 isotopes to the second amount of carbon-12 isotopes within a first target range corresponding to the target ratio exhibited by the carbon dioxide mixture.

I claim: 
     
         1 . A diamond composition:
 comprising carbon sourced from air and comprising:
 a first amount of carbon-13 isotopes; and 
 a second amount of carbon-12 isotopes; 
   formed via chemical vapor deposition of a set of diamond seeds exposed to a hydrocarbon mixture comprising carbon sourced from air; and   exhibiting a first ratio of the first amount of carbon-13 isotopes to the second amount of carbon-12 isotopes exceeding −10.0 parts-per-thousand-versus-PDB-standard.   
     
     
         2 . The diamond composition of  claim 1 , exhibiting the first ratio of the first amount of carbon-13 isotopes to the second amount of carbon-12 isotopes falling within a target range between −10.0 parts-per-thousand-versus-PDB-standard and 1.0 parts-per-thousand-versus-PDB-standard. 
     
     
         3 . The diamond composition of  claim 1 , exhibiting the first ratio of the first amount of carbon-13 isotopes to the second amount of carbon-12 isotopes exceeding −5.0 parts-per-thousand-versus-PDB-standard. 
     
     
         4 . The diamond composition of  claim 1 , forming a diamond configured to insert into a setting to generate a diamond product wearable by a user. 
     
     
         5 . The diamond composition of  claim 1 :
 further comprising carbon sourced from ground and comprising:
 a third amount of carbon-13; and 
 a fourth amount of carbon-12 isotopes; and 
   exhibiting a second ratio of the third amount of carbon-13 isotopes to the fourth amount of carbon-12 isotopes less than −10 parts-per-thousand-versus-PDB-standard.   
     
     
         6 . The diamond composition of  claim 1 , exhibiting a carbon-13 concentration, comprising the first amount of carbon-13 isotopes, within a carbon-13 concentration range, carbon-13 concentrations within the carbon-13 concentration range exceeding an average carbon-13 concentration exhibited by natural diamonds. 
     
     
         7 . The diamond composition of  claim 1 , comprising carbon sourced from air and excluding carbon sourced from ground. 
     
     
         8 . A material composition:
 comprising carbon sourced from air and comprising:
 a first amount of carbon-13 isotopes; and 
 a second amount of carbon-12 isotopes; and 
   exhibiting an isotopic signature defining a ratio of the first amount of carbon-13 isotopes to the second amount of carbon-12 isotopes exceeding −20.0 parts-per-thousand-versus-PDB-standard.   
     
     
         9 . The material composition of  claim 8 , comprising a diamond comprising carbon sourced from air and formed via chemical vapor deposition of a diamond seed in the presence of a gaseous hydrocarbon mixture comprising carbon sourced from air. 
     
     
         10 . The material composition of  claim 8 , comprising a carbon black material comprising carbon sourced from air. 
     
     
         11 . The material composition of  claim 8 , comprising carbon sourced from air and excluding carbon sourced from ground. 
     
     
         12 . The material composition of  claim 8 :
 excluding carbon sourced from ground; and   defining the isotopic signature defining the ratio of the first amount of carbon-13 isotopes to the second amount of carbon-12 isotopes exceeding −10.0 parts-per-thousand-versus-PDB-standard.   
     
     
         13 . The material composition of  claim 12 , defining the isotopic signature defining the ratio of the first amount of carbon-13 isotopes to the second amount of carbon-12 isotopes exceeding −10.0 parts-per-thousand-versus-PDB-standard and less than 5.0 parts-per-thousand-versus-PDB-standard. 
     
     
         14 . A method comprising:
 accessing a set of composition data derived for a first material, comprising an amount of carbon, via mass spectrometry during execution of a standard carbon-13 test for a portion of the first material, the first material comprising an amount of carbon comprising carbon-12 isotopes and carbon-13 isotopes, the set of composition data comprising a first amount of carbon-13 isotopes and a second amount of carbon-12 isotopes;   deriving a first isotopic signature for the first material based on the set of composition data, the first isotopic signature defining a first ratio of the first amount of carbon-13 isotopes to the second amount of carbon-12 isotopes; and   in response to the first ratio falling within a target range defined for materials comprising carbon sourced from air:
 verifying the first material as generated from carbon derived from an air source; and 
 ogenerating a report indicating verification of the first material as generated from carbon derived from the air source. 
   
     
     
         15 . The method of  claim 14 , wherein verifying the first material as generated from carbon derived from the air source in response to the first ratio falling within the target range comprises verifying the first material as generated from carbon derived from the air source in response to the first ratio falling within the target range exceeding −20 parts-per-thousand-versus-PDB-standard. 
     
     
         16 . The method of  claim 14 , wherein verifying the first material as generated from carbon derived from the air source in response to the first ratio falling within the target range comprises verifying the first material as generated from carbon derived from the air source in response to the first ratio falling within the target range exceeding −10 parts-per-thousand-versus-PDB-standard and falling below 5.0 parts-per-thousand-versus-PDB-standard. 
     
     
         17 . The method of  claim 14 :
 wherein accessing the set of composition data derived for the first material comprises accessing the set of composition data derived for the first material comprising a diamond;   wherein deriving the first isotopic signature for the first material comprises deriving the first isotopic signature for the diamond; and   wherein verifying the first material as generated from carbon derived from the air source comprises verifying the diamond as generated from carbon derived from the air source.   
     
     
         18 . The method of  claim 14 :
 wherein accessing the set of composition data derived for the first material comprises accessing the set of composition data derived for the first material comprising a sample of carbon black;   wherein deriving the first isotopic signature for the first material comprises deriving the first isotopic signature for the sample of carbon black; and   wherein verifying the first material as generated from carbon derived from the air source comprises verifying the sample of carbon black as generated from carbon derived from the air source.   
     
     
         19 . The method of  claim 14 , further comprising, in response to the first ratio falling outside the target range:
 withholding verification of the first material as generated from carbon derived from the air source; and   generating a second report indicating identification of the first material as generated from carbon derived from a ground source.   
     
     
         20 . The method of  claim 19 :
 wherein verifying the first material as generated from carbon derived from the air source in response to the first ratio falling within the target range comprises verifying the first material as generated from carbon derived from the air source in response to the first ratio falling within the target range between −10 parts-per-thousand-versus-PDB-standard and 5.0 parts-per-thousand-versus-PDB-standard; and   wherein withholding verification of the first material as generated from carbon derived from the air source in response to the first ratio falling outside the target range comprises, in response to the first ratio falling outside the target range between −10 parts-per-thousand-versus-PDB-standard and 5.0 parts-per-thousand-versus-PDB-standard:
 withholding verification of the first material as generated from carbon derived from the air source; and 
 verifying the first material as generated from carbon derived from ground.