In August this year, the GIA Gemological Institute of America certified a diamond ring cut from a whole lab-grown diamond. The client sent this unique 4.04-carat monocrystalline solid diamond faceted ring to GIA's New York laboratory for evaluation, marking an important milestone in the development of monocrystalline Faceted diamond rings.
This ring is produced by Dutch Diamond Technologies in cooperation with Belgian jewelry store Heursel. Combining advanced technology and traditional craftsmanship, the entire ring is cut and ground from an 8.54-carat chemical vapor deposition (CVD) grown diamond plate. The ring is 3.03 mm thick, with an inner diameter of 16.35-16.40 mm and an outer diameter of 20.32-20.40 mm.
This lab-grown diamond ring is cut from an 8.54-carat crystal grown using chemical vapor deposition (CVD) and laser-cut to create a near-perfect ring. This laboratory-grown one-piece diamond ring, after GIA research, based on the dark non-diamond carbon dot inclusions (typical growth residues of CVD-grown diamonds), the clarity can be judged to be VVS2, and it has " "Good" polishing level (but the polishing of the inner surface of the ring does not reach the "Very Good" level). Despite the ring's near-perfect torus shape (Fig. 2), the symmetry quality class was deemed inapplicable in this case. According to the GIA color grading scale, this diamond has a high color grade. Spectral analysis revealed that this was a Type IIa diamond (nitrogen could not be detected), and no hydrogen-related peaks were detected at 3107 or 3123 cm-1. Photoluminescence (PL) spectroscopy detects interesting structural vacancy-related defects, revealing their complex growth methods. The strong signal of silicon-vacancy (SiV–) defects can be observed under 633nm laser stimulation; this is a common feature that can be used to identify CVD-grown diamonds. The conclusion is, the conclusion is that this ring has not been post-growth treated.
Image Source: Paul Johnson (left) and Madelyn Dragone (right)
Under microscopic analysis, a strong birefringence pattern (birefringence) can be observed under cross-polarized light illumination, and it exhibits an unusual radial pattern (left), which indicates that this diamond is less complex than typical CVD diamonds on the market. Rings have unique growing conditions. Deep UV illumination of the DiamondView Fluorescence Imager (right) confirms these unusual growth features—the absence of post-growth fluorescent colors, such as green, due to H3 centers.
"While this type of 'ring' has been documented before, this is the first time GIA has identified a ring carved from a whole lab-grown diamond," said Tom Moses, GIA Executive Vice President and Chief Laboratory and R&D Chief Executive Officer. rings. As lab-grown diamond growing techniques continue to advance, we expect more innovative applications for these diamonds. Breakthrough research and developments will allow lab-grown diamonds to reach their full potential, developing new applications and advancing the jewelry industry. Technological development."
0 Comments