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Case study of 2.23 carat #Synthetic #Diamond identification at GIA.
One synthetic diamond was submitted to a GIA laboratory for confirming it's identity. It is often that this diamond looks very similar to natural but in most of the time in jewellery market synthetic dimonds are carefully mixed with original one. This was a case study recently identified by me on 7. 02.2019 when a" D-color 2.23 ct" round brilliant cut diamond was submitted to the #Carlsbad laboratory of #GIA for a diamond grading report on behalf of a known client who purchased the stone at approx 3laks 70000 with local certificate on jan ,2019from a reputated gem seller .
The GIA report confirmed Its #infrared absorption spectrum established as type IaA>B, with #nitrogen #aggregates around 80 ppm, confirming a natural color origin but stated as synthetic.
There are very few gemological indicators to test any lab-grown diamonds (like :-S. Eaton-Magaña and C.M. Breeding, which any local non GIA approved lab never used).Yet one of the most reliable and easily seen observations is the lack of birefringence (due to strain patterns in HPHT synthetics when viewed between crossed polarizers. Clear visible sible strain in HPHT-grown synthetic diamonds are only been seen through #three dimensional crystal #analyzer.
With further investigation using a variety of techniques such as #photoluminescence spectroscopy and DiamondView imaging, confirmed that the stone is a clear synthetic. Additionally, #microscopic observation revealed #unidentified #dark natural crystal inclusions figure "A "which is actually nothing but a #metallic #flux.
Subsequently the client indicated that this stone was believed to be synthetic after examination by another Gemmologist of Delhi in the trade. However, several gemological and spectroscopic tests confirmed its natural origin when it is actually tested from GIA.