Platinum’s rare nature gives it additional value and appeal

Huw Daniel is the CEO of Platinum Guild International, overseeing market development activities in China, Japan, India and the USA, on behalf of the platinum producers of South Africa. Before taking up this role in 2015, Huw ran PGI USA for 12 years...

13 september 2021

Marco Carniello: We want to continue to be the engine boosting the jewellery industry

Italian Exhibition Group (IEG) is a leader in Italy in the organisation of trade fairs and one of the main operators in the trade fair and conference sector at European level, with structures in Rimini and Vicenza, as well as further sites in...

06 september 2021

There is a significant need for smart and technological financial solutions in the diamond industry

MDPS, the Israeli start-up Fintech company from the Mazalit Group is gearing up to enter the diamond industry soon. Zeev Maimon, the CEO of MDPS is also the Founder / CEO of MAZALIT, a B2B payment platform designed and dedicated to the global diamond...

30 august 2021

The future for synthetics lies in that it has become possible to grow a stone you want and make what you want out of it

Alex Popov, President of the Moscow Diamond Exchange and head of the Âme jewelry brand, which uses lab-grown diamonds to produce jewelry, sat for an interview with Rough&Polished sharing his views on the coexistence of natural and man-made diamonds in...

23 august 2021

De Beers’ GemFair ropes in more than 160 Sierra Leone artisanal miners

De Beers inaugurated its GemFair pilot programme in Sierra Leone’s Kono District with 14-member mine sites in 2018 to create a secure route to market for ethically sourced artisanal and small-scale diamonds. GemFair programme manager Ruby Stocklin-Weinberg...

16 august 2021

GIA’s Carlsbad laboratory examined an interesting attempt to imitate a natural green diamond

30 august 2019

news_08062018_gia.pngGIA’s Carlsbad laboratory examined an interesting attempt to imitate a natural green diamond when a 6.49 ct green crystal was submitted for a Colored Diamond Grading Report. The surfaces of the resorbed octahedron were covered by uneven patches of green color. Fourier-transform infrared (FTIR) analysis revealed a typical type Ia diamond with abundant nitrogen and hydrogen impurities. However, the ultraviolet-visible (UV-Vis) spectrum was very unusual and did not show any of the bands that are produced by radiation damage in diamond (e.g., the GR1 defect). 
Careful examination under magnification found that the green color was not due to radiation stains, but instead to groupings of emerald-green platy crystals, ~40 μm in size, attached to the diamond surface. Individual platy crystals could easily be flaked off using tweezers or a pointer probe, but they remained adhered to the surface under normal gem testing situations. 
X-ray fluorescence (XRF) analysis indicated high concentrations of chromium, and Raman analysis identified the green plates as chromium oxide. 
The use of chromium oxide powder to produce a green coating—along with annealing of the powder to produce crystallized plates that adhere to the rough surface to resemble radiation stains—represents a significant attempt to artificially reproduce the features seen on natural green diamonds, GIA reported. 

Alex Shishlo, Editor of the Rough&Polished European Bureau