Workers at Lesotho’s Letšeng mine have discovered an absolute whopper of a diamond, rated at 910-carats. Roughly the size of two golf balls, the precious gem has an estimated value of $40 million (£29 million). Read More >>

Not all gemstones are created equal. While some rubies are clear and beautiful, others are dull, filled with flaws, and the colour of old blood. Scientists have found that chucking them in a serious microwave can really improve them. Read More >>