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A price chart of diamonds would, by definition, have to be very large as the differences in diamonds with the cut, size, weight, color and clarity make for an almost infinite price of diamonds.

History of Diamond Prices

The price of diamonds has changed little over the years. Particularly in view of the increase in inflation.

Diamond Price Chart
To really understand the price of diamonds one needs a Diamond Price Chart.
Here is some information to help you understand how diamonds are priced.
Diamonds are priced according to a number of factors, Cut, Color, Clarity and Carat. These are called the 4Cs.
Probably the most well know is the carat. That refers to the size of the diamond and an example chart is given here.

Diamond ShapeNext is the Shape, sometimes erroniously referred to as the cut. This describes the shape of the diamond. There are eight basic shapes of diamonds but more are being added on a regular basis.

Round Brilliant
Emerald Cut
Princess Cut
Heart Cut
Oval Cut
Marquise Cut
Pear Cut
Round Brilliant

These are graphically shown at the top of the page.

Diamond ColorThe next is Color. All diamonds are graded by color and this is the scale that is used.

D Pure White - the most prized color
E Exceptional white - colourless group
F Excellent white - colourless group
G Good white - colourless group
H White - colourless group
I Slightly tinted white/ white when viewed from top
J Slightly tinted white/ commercial white
K Tinted white/ still acceptable white when mounted
L Tinted white/ needs yellow setting to look its best
M Slightly yellowish/Tinted color-champagne
N Slightly yellowish/Tinted color-champagne
O-R Yellowish/Tinted color
S-Z Yellow/Tinted color

Diamond ClarityClarity is the next grading. This grading scale is as follows:

IF would have no inclusions and be internally flawless, perfect clarity in other words.
Both grades VVS1 and VVS2 would be very very small inclusions, pin pricks in fact.
VS1and VS2 are still very small and difficult to see.
SI1 and SI2 would be tiny but easily seen.
I1 is small and recognizable immediately.
I2 and 13 would have larger and/or numerous inclusions, obvious recognizable immediately

Diamond PiqueThere is also third pique (pronounced peekay) sometimes written as p3. This is a French word meaning pinprick. It generally refers to interior marks and inclusions in a diamond.

Diamond WeightLastly there is diamond weight. Diamonds are weighed in carats. A carat is .2 grams. A gram of diamond would be a massive 5 carats. Very large in diamond terms although the actual diamond is small. A carat is further divided into Points, and there are 100 Points to a carat. So 1 point is .002 of a gram. Very small indeed.

There is a scale of weight for Diamonds and this is shown here:

Without having pages and pages of charts for diamond prices that change throughout the year depending on supply and demand. You can, by studying the above, get a sense of the cost of diamonds and their value.

In all cases ensure that a proper diamond appraisal is done and a certificate giving the characteristics of the diamond is produced. That is much better than a complex price chart of diamonds.

A recommended jeweler also is James Allen .

More on diamonds here