Rubies and emeralds get their colours from a common metal
Both rubies and emeralds are minerals, which is a type of rock with a consistent chemical composition and a highly ordered ...
Why are rubies red and emeralds green? Their colors come from the same metal in their ...
The colors of rubies and emeralds are so striking that they define shades of red and green—ruby red and emerald green. But ...
Mining8 天
Gemfields halts emerald sales over Zambia export tax
Zambia, the world’s second largest emerald producer after Colombia ... which includes the existing 6% mineral royalty tax. This would force the company to lay off employees, chief executive ...
来自MSN1 个月
Gemfields asks Zambia to reverse emerald export tax
The southern African country, the world's second largest emerald producer after Colombia ... to the Zambian government in the form of mineral royalty, corporation tax and dividends, the company ...