Blue diamonds are highly rare in their natural state. They are more exquisite and stunning than those other blue gemstones which make them extremely beautiful. They are high-priced due to their rarity, whether or not they have been improved in a lab. The largest blue diamond in the world is the Hope Diamond which is situated in Washington, D.C. at the Smithsonian; it weighs in at 45.52 carats.


They are graded on the same scale as colorless diamonds. The weights of blue diamonds are measured in carats. Blue diamonds are especially sky-high when they are at least 1 carat or above. Clarity is equally important in determining the value of a blue diamond. The clarity of a blue diamond is measured on a scale with ratings of VVS, VS, SI and I. VVS stands for very very slightly included, VS is very slightly included, SI is slightly included and I stands for included. VVS blue diamonds are the most expensive, while I blue diamonds are the least valuable.

Types of Cuts

There are a few cuts which highlights the brilliant glaze and color of blue diamonds. They are found in brilliant-round cuts, heart shape cuts, pear shape cuts, princess-square cuts and marquis cut. The cut of a blue diamond can increase the value of the gem if it is cut precisely. Cuts are rated on a scale of excellent, very good, good, fair and poor. Excellent cut blue diamonds are the most precious, while blue diamonds that are rated poor are the least valuable.

Colors of Blue

Blue diamonds have different shades of blue.  The natural hue of blue before lab enhancements are deep aquamarine, green tinge, ice blue and rich deep blue. You must know that the majority blue diamonds on the market are lab improved through heat treatment, which deepens the color of the stone. Larger blue diamonds that are 1 carat or more have a better color saturation which boosts the value of the stone.


Some blue diamonds which are color enhanced are subject to changes in hues due to heat and cleansing materials. They should be stored or placed in direct sunlight for extended periods of time. When they are exposed to sunlight they fade. You have to use mild liquid dish soap and a soft, clean cloth when cleaning your blue diamonds and blue diamond jewelry. Never use harsh soap and chemical because it will tarnish the stones and would leave some soap residue which will make the stone appear fake and dull.

You can check out the Blue Nile review to further help you in your quest for the best blue diamond engagement ring for you and your loved one today.