TYPE - Natural or Laboratory grown diamond

The type of diamond differentiates between a natural diamond formed

in the earths crust millions of years ago and that of one which

is almost identical in its physical properties, but formed under

 controlledconditions in a scientific laboratory.

Lab grown diamonds are regarded by some as more ethical for the

environment and can be up to 70% cheaper than natural mined diamonds.

COLOUR - The shades of natural colour in a diamond

Diamonds are generally colourless, near colourless or slightly yellow. A diamond which is completely colourless is more desirable, and therefore more expensive, than one which is near colourless or even slightly yellow.

Diamonds are graded from D to F, which are colourless, G to J (near-colourless) and then up to Z which will appear from slightly yellow to yellow.