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D colour diamonds
A diamond made purely from carbon will be colourless, while those that contain some nitrogen atoms will be yellow. It is very rare for a diamond to contain no nitrogen at all and these diamonds are considered truly colourless, though, it may be impossible to differentiate a diamond that contains a tiny amount of nitrogen from a diamond that contains no nitrogen and both could be graded as a D colour.
Emerald cut diamonds
An ‘emerald cut’ is a rectangular shape, step cut and they account for a very small amount of diamonds available worldwide. The modern emerald cut can have 49 facets or more and they are called ‘emerald’ cuts because this type of cut was first developed for emeralds* and then later adopted by diamond cutters.
What are salt and pepper diamonds?
The cost of a salt and pepper diamonds depends on its size, its colour, cut and transparency.
A stone that is mostly clear but has a few large visible inclusions will be worth more than a stone which has many tiny inclusions. A stone with multiple small inclusions may appear to be grey or milky white because of the way they affect the light that enters the diamond and is reflected out.
Advice for buying a pear cut enagement ring
Faceted and cabochon gemstones
In very simple terms, a faceted stone has many flat sides and a cabochon is smooth. Faceted stones are more popular for transparent stones and cabochons are more popular for opaque or translucent stones. Although you can find most stones in both faceted or cabochon shapes.