Natural vs. Synthetic: Advanced Detection Methods

Since lab-grown diamonds consist of the same carbon crystal structure as natural diamonds, traditional tools like thermal conductivity pens cannot distinguish them. Gemological laboratories like GIA, IGI, and HRD use advanced spectroscopic and imaging systems to ensure 100% accurate identification.

Key Diagnostic Identifiers

Advanced screening looks for specific growth and structural signatures:

1. UV Fluorescence Imaging: Devices like the DiamondView use short-wave UV illumination to reveal growth patterns. Natural diamonds display octahedral growth sectors, while HPHT diamonds show cuboctahedral sectors (cross-like patterns), and CVD diamonds exhibit parallel growth striations.
2. Photoluminescence (PL) Spectroscopy: PL spectroscopy is extremely sensitive. It can detect silicon-vacancy (SiV-) centers, which are a strong indicator of CVD growth, or nickel/cobalt impurities leftover from HPHT catalyst fluxes.
3. FTIR Spectroscopy: Fourier-Transform Infrared spectroscopy determines diamond type. The vast majority of natural diamonds are Type Ia (containing aggregated nitrogen). Almost all CVD and HPHT diamonds are Type IIa (nitrogen-free) or Type Ib (containing single substitutional nitrogen).

"While type screening is a useful first step, finding a Type IIa diamond does not mean it is synthetic; it simply means it must undergo further spectroscopic testing to confirm its origin."

In-House Screening for Wholesalers

B2B traders can implement desktop screening devices (such as the Yehuda Sherlock Holmes or GIA i100) to quickly sort melee parcels. However, high-value individual gems should always be referred to major laboratories for comprehensive spectroscopic reports, protecting the supply chain from synthetic mixing.