Assaying
Assaying
Assaying is an analytical procedure in metallurgy employed to qualitatively determine and quantitatively measure the composition of elements present in a given alloy sample.
CGR operates assaying laboratories, primarily catering to the needs of the jewellery trade in India, whose settlements are based on purity analysis. We employ various methods for assay, Starting from the classical Fire Assay to the more sophisticated Spark Optical Emission Spectrometer, Each unique in terms of process durations & accuracy.
| GOLD | |
| Testing method | Accuracy |
|---|---|
| Density measurement | Bimetals only |
| Touchstone | ± 4% |
| Chemical parting (acid test) | ±1% |
| X-ray spectrometry | ± 0.5% |
| Atomic absorption spectrometry | ± 0.1% |
| Fire Assay | ± 0.04% |
| ICP OES | ± 0.04% |
| Spark OES | ± 0.02% |
| SILVER | |
| Gravimetric Analysis | ± 0.2% |
| Potentiometric Analysis | ± 0.2% |
Assaying as per
IS 1417: 2009 ( Gold jewellery & alloys )
IS 1418: 2007 ( Gold fire assay )
IS 2112 & IS 2113 ( Silver alloys )
IS 17025: 2017 ( Laboratory management )