Synthetic Blue Diamonds

Button to see available blue diamonds
AOTC primarily offers polished blue diamonds from fancy light blue to fancy vivid blue, and up to 1.50 carats.

Images of different blue diamonds

Origin of Blue Color

Chart showing blue tone and saturation
The tone and saturation
of color gives our diamonds
their natural beauty
and range of color.
Periodic element tile for boron Being one of the forms of carbon, diamonds are made of carbon atoms, but receive their color from impurities trapped inside the diamond lattice. To produce blue diamonds, we add boron to a growth cell and restrict other impurities, primarily nitrogen, from entering the growing diamond's lattice. This is achieved by using special substances called 'getters' which capture unwanted impurities. During diamond growth, a boron atom replaces a carbon atom in the diamond lattice, creating a blue 'color center'. This 'color center' absorbs all visible light except for blue. The blue color is reflected back and gives the diamond its color.

The more boron in the diamond, the more saturated the blue color is. By controlling the amount of boron entering the diamond lattice, we are able to control the ultimate color, within one or two color grades.

Boron present in all blue diamonds, both natural and lab grown, causes them to be electrically conductive.

Growth Duration

The presence of boron slightly accelerates diamond growth, compared to synthesis of a white diamond. One press cycle typically runs for seven to ten days and will create one rough diamond that could be cut into a half to one carat diamond.


Rough blue diamonds
Blue diamonds straight from the growth units.
AOTC offers most popular shapes, with the majority being round brilliants due to overall demand. Fancy shapes such as princess, radiant, cushion, asscher and emerald are also being offered. Elongated shapes such as marquise and pear typically have low yields since the size is determined by the longest dimension of the squarish rough. For this reason, elongated shapes are not normally produced.


All synthetic blue diamonds are type IIb.