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Diamond & Gemstone Treatments

The AGTA defines 'enhancement' as any traditional process other than cutting and polishing that improves the appearance (color/clarity/phenomena), durability or availability of a gemstone.

Below is a helpful key describing what each treatment code means.

<table>
<tr>
<td>N</td>
<td>Natural, or No Enhancement</td>
</tr>
<tr>
<td>B</td>
<td>Bleaching</td>
</tr>
<tr>
<td>C</td>
<td>Coating</td>
</tr>
<tr>
<td>D</td>
<td>Dying</td>
</tr>
<tr>
<td>F</td>
<td>Filling</td>
</tr>
<tr>
<td>H</td>
<td>Heating</td>
</tr>
<tr>
<td>HP</td>
<td>Heating and Pressure, or HPHT</td>
</tr>
<tr>
<td>I</td>
<td>Impregnation</td>
</tr>
<tr>
<td>L</td>
<td>Lasering</td>
</tr>
<tr>
<td>O</td>
<td>Oiling</td>
</tr>
<tr>
<td>R</td>
<td>Radiation</td>
</tr>
<tr>
<td>U</td>
<td>Diffusion</td>
</tr>
</table>