A mount is a set of prongs (called a claw, crown, or coronet) that hold a gemstone and attach it to a plain band ring. It is a common setting for a diamond solitaire engagement ring.

D stones  are colourless. They are both very rare and very expensive given they are awarded the highest quality colour grading possible.

 To the naked eye an E colour graded stone will look as good as a D, however to the expert the E is not totally colourless and  as a result are less expensive.

To the untrained eye an F colour graded stone will look similar to an E colour graded stone. This is still classed as a high quality stone. The perfection of the colourless  D stone is not present nor does it match the superior quality of the E  and as a result is proportionately priced lower.

G colour graded stones will still appear colourless if in isolation, it is only when they are compared with the highest quality colour graded stones that a difference can be seen. This difference however is reflected in the price and therefore has its advantages.

H colour graded diamonds appear almost colourless if in isolation, only when compared with the highest quality colour graded stones do they appear less white. The price for H graded diamonds is very competitive given they are still classed amongst the colourless diamonds but do boast  lower prices.

FL - Flawless stones are completely flawless as the name suggests. They are both very rare and very expensive given they are awarded the highest quality clarity grading possible.

IF - Internally Flawless stones are completely flawless from the inside however they will have surface graining. They are still however of the highest quality, very rare and demand high prices.

VVS1 - Very Very Slightly Included 1 clarity graded stones will look as good as the Internally flawless stones to the naked eye. Only a very powerful microscope would detect the one minute inclusion. They are still of the highest quality and very rare, although as a result of the inclusion are less expensive in comparison to the Internally Flawless stones.

VVS2 - Very Very Slightly Included 2 clarity graded stones will still look as good as the Internally flawless stones to the naked eye. With 10x magnification the two minute inclusions can barely be detected. Often a gemological microscope is needed. They are still of a high quality, however the two inclusions secures them a lower price from the VVS1 graded stones.

VS1 - To the naked eye Very Slightly Included 1 stones will still appear flawless however under 10x magnification the diamond will have either a small inclusion or several minute inclusions. These inclusions are reflected in the  proportionately lower price making them a popular choice.

VS2 - To the naked eye the vast majority of  Very Slightly Included 2 stones will still appear flawless unless placed under 10x magnification, when they will be easily noticeable. They will tend to have two small inclusions or a series of minute inclusions which result in lower prices. Given VS2 still predominantly achieve an appearance of flawlessness to the naked eye they are a popular choice.

SI1 - Slightly Included 1 stones will have two medium inclusions or many small inclusions that will usually only be easily visible under 10x magnification. They almost always appear flawless depending on the locations of the inclusions, the shape of the diamond (Step cut diamonds, Asscher and Emerald Cuts inclusions will not be clean to the naked eye)  and the colour grading. Slightly Included 1 graded diamonds can therefore be an excellent buy.

SI2 - Slightly Included 2 stones will have a further increase of inclusions than the SI1 stones. They will largely only be easily visible under 10x magnification. They usually appear flawless depending on the locations of the inclusions, the shape of the diamond (Step cut diamonds, Asscher and Emerald Cuts inclusions will not be clean to the naked eye) and the colour grading. Given the significant price difference from true flawless stones, SI2's can be great value for money.