The difference in diamond grading between laboratories like GIA (Gemological Institute of America) and DCLA (Diamond Certification Laboratory of Australia) can occur due to the subjective nature of diamond grading and variations in grading standards, tools, and methodology. Here’s a detailed explanation of why this happens, using your example of a diamond graded GIA E VS2 vs DCLA F SI1:
Graff has opened its biggest store in North America, at the Fontainebleau Las Vegas luxury resort and casino.
A 35.09-carat sapphire yesterday (27 May) set a new world record for the highest per-carat price paid at auction.
A fancy intense 3.03-carat pink diamond is among the highlights at Phillips’ New York Jewels Auction next month with a $1.2m to $1.6m estimate.
The Blue Belle sapphire and diamond necklace is to lead a Christie’s New York sale next month with an estimate of $8m to $12m.
Lucapa Diamond Company has entered voluntary administration following a major cost-cutting initiative and a significant reduction in its corporate workforce. The decision comes in the wake of mounting financial pressure and weakening global diamond demand, attributed in part to US President Donald Trump’s trade tariffs, which have disrupted pricing and buyer confidence.
Petra Diamonds is to begin discussions with financiers on refinancing a $273m bond that matures in March next year amid scepticism that the company will survive the event.
Lucara is drawing down up to $28m in emergency funding for its underground mine expansion after reporting a slump in Q1 earnings and lowering its revenue guidance for the full year.
A dazzling piece of underworld history is heading to auction: Al Capone’s custom diamond-studded pocket watch, crafted from platinum and set with 90 diamonds, will go under the hammer at Sotheby’s next month. The extraordinary Patek Philippe timepiece, dripping in gangster-era flair and opulence, is expected to fetch between USD $80,000 and $160,000.
Laurence Graff and his son Francois are ranked 44th in the newly-published Sunday Times Rich List 2025 of Britain’s 350 wealthiest individuals.