The larger the diamond, the better its parameters, the higher the increase in its value. Such diamonds are most sought after by the finest jewelry houses, to create unique jewelry from them.
The above graph and the 20-year increase in value for round-cut diamonds, brilliant, take into account all grades of this cut, so not only are included here the value increases for diamonds of the best quality, best cut parameters in terms of proportion, polishing and symmetry, which for each of them should be excellent, but also all the others. An ideally polished diamond should have a classification of the cut of 3 x Excellent.
In summary, the above table for diamonds from 5,00 to 5,99 ct. does not take into account this element of the 4C. This is especially a very important element for colorless diamonds, because it determines their demand, which is a much more important factor in terms of this type of diamonds and creating demand and increasing value, than by color diamonds, where demand is also found by diamonds with other cuts and even inferior cut quality, because the color diamond itself is an exceptional work of nature.
For diamonds from 5,00 to 5,99 ct. of round brilliant cut, polished in the best parameters of 3 x Excellent, the value increases are on average and on a 20-years basis of above 200 %, and on average and on 10-years basis above 100 %. This is taken into account in the graphs below. Additionally, in the second graph we show you a 10-year increase in value for diamonds of this size and also for diamonds in the sizes from 3,00 to 3,99 and 4,00 to 4,99 ct., of a cut 3 x Excellent.
Below, we also present graphs indicating the increases in value on a 20-years basis for colorless diamonds, in sizes from 3,00 to 3,99 and 4,00 to 4,99 ct., for round brilliant cuts, polished in the best proportions, 3 x Excellent, compared to the average increases in the value of these diamonds, but for all quality classes of this cut.