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Aside from color grade, which is measured in stages from light to intense, the size (or carat) of a blue diamond has the most effect on it's pricing, and diamond prices rise exponentially as you increase the size and rarity. Likewise, clarity matters less than in a clear diamond, since the color prevents flaws from being as visible.
The cut of rare blue diamonds is usually selected to best accent their color, unlike a clear diamond which is cut to add brilliance. You should always take a jewelers advice when cutting a rare diamond, as you may actually detract from its appeal and worth by imposing an unflattering cut. You should also know that if you select a blue diamond, certain shapes and cuts may not always be available at the time of purchase due to the rarity of the stone and the fact that each is cut individually to best flatter its tone.
If you are considering setting the diamond in a piece of jewelry, you should consider what metal will best flatter the shade of blue in your diamond. Ask your jeweler for a recommendation on what metal will be of the most value, but know that platinum, white gold or silver is the most popular shade. You should always ask about the certification of the diamond before purchase. -
A blue diamond is exceptionally rare, making it's pricing (for natural stones) impossible to predict. The Hope Diamond, the most famous of these examples, is also perhaps the best example, weighing in at a whopping 44.5 carats. Most of the blue diamonds you will encounter in the market will be enhanced or synthetic, using a process which takes a naturally clear diamond and permanently alters its surface color through heating or irradiation.
Synthetic diamonds, however, are also uncommon and are among the most sought out stones along with pink and yellow (or canary) diamonds. You should consult a specialist when comparing prices on blue diamonds, as standards are set per stone for natural rocks, and by an expert for synthetics. You should be aware, however, that you will pay significantly more for a blue diamond than a normal stone and plan to price accordingly. Yellow and pink diamonds, more commonly available for pricing, can be used as a good comparative guide when estimating the purchase price of a blue diamond made synthetically.
