Lab also rolling out new comments clarifying impact of fluorescence.
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US president sent letters to 14 countries, noting a start date of August 1 for duties.
Deposit is third of six kimberlites in the area, thought to contain more than 40 million tonnes of ore bearing rough stones.
Vickie Rokkos will lead the jewelry brand in North America.
Andrew Rickard, president of the Jewelers Board of Trade, stresses the importance of checking customers’ credentials.
Revenue from jewelry category up 18% year on year in first quarter.
Company upgraded procedures after fatal armed robbery, it says.
Authorities want him to stand trial for his part in alleged PNB bank fraud.
Economics and finance ministry rejects “lab-grown” tag.
Employees have suffered 50% pay cut, local union says.
CEO will depart at the end of the year.