que o diamante esteja contigo

Chineses utilizaram pela primeira vez o diamante
Stone age craftsmen in China were polishing jade objects using diamond 2,000 years before anyone else had the same idea, new evidence suggests.
Quartz was previously thought to be the abrasive used to polish ceremonial axes in late stone age, or neolithic, China.
But the investigations of a Chinese-US team of scientists indicate that quartz alone would not have been able to achieve such lustrous finishes.
The team reports its diamond findings in the journal Archaeometry.
Harvard University physicist Peter Lu and colleagues studied four ceremonial burial axes, the oldest of which dates to about 4,500 years ago.
The team used X-ray diffraction and electron microprobe analysis. This determined that the most abundant mineral in the axes was corundum, known as ruby in its red form and sapphire in all other colours.
in BBC - ver mais.