The largest diamond ever found is still the Cullinan Diamond (S.A., 1905) which weighed in at a jaw-dropping 3 000+ carats (or 1.3 pounds). Cut down into smaller diamonds, some pieces of the Cullinan are now part of the British Crown Jewels, making them a Queen’s best friend.
As a child we all have our favourite colours – perhaps you still do? When it comes to rocks, some people covet the purity of a clear, colourless diamond, while others find a yellow diamond warmer in tone. The differing colouration of diamonds comes down to natural chemistry. A white diamond is pure carbon but other natural elements sometimes enter the mix at source, resulting in a chemical reaction and new colouration - for instance, nitrogen (yellow) or boron (blue).
Clarity measures the flawlessness of a diamond. The clearer the diamond, the more valuable it is - although diamonds, like people, gain some charming character from their ‘flaws’. Diamond flaws are natural birthmarks called ‘inclusions’ if inside the diamond and ‘blemishes’ if on the surface. Experts measure clarity with a loupe, a small powerful magnifying glass. Learn more: http://www.nwj.co.za/good-to-know
‘Cut’ - refers to the visible shape of a diamond (pear, emerald, square, and round). Cut is also about how the angles and facets sparkle off each other, the symmetry of the cut and the polish of the surface. The cut determines the value of your diamond, because in a well-cut stone the brilliance and beauty of diamond is fully achieved. Round diamonds tend to be the most brilliant, followed by square cuts. To cut a long story short, the more light a diamond reflects, the better the cut.
4 C’s - You have Charm, Charisma, Character and Class – but what are the four C’s that define a quality diamond? Cut, clarity, colour & carat. Whatever combination of the four C’s makes up your chosen NWJ diamond, you can rely on accurate valuation and pricing – with a beautiful extra sparkle of our famous value for money. Learn more: http://www.nwj.co.za/good-to-know
The karat is the standard measurement for gold and is divided into 24 parts. Pure gold is 24 karats, meaning 24 out of its 24 parts are gold – this makes for your ‘yellowest’, most classical-looking gold, but it’s also a pretty soft gold to work with.
To increase its strength, gold is diluted with other metal alloys, decreasing its purity but increasing its strength. For instance, 14K gold is 14 parts gold and 10 parts other alloys, while 18K gold is 18 parts gold and 6 parts other alloys. The alloys used can also affect gold’s colour: ‘pink gold’ is created by adding large amounts of copper while green gold requires copper, silver and zinc. For white gold, mix it up with copper, zinc and nickel or palladium. Learn more…