Black Sapphire vs Black Diamond

black diamondYou want to buy a new pair of earring or maybe a wedding ring.

There are gorgeous gems of all the colors of the rainbow.

However, one clearly stands out: black color gemstones.

This unique group has two exquisite members: black sapphire and black diamond.

These two hard gems, share the same color and can get confused for one another.

Let’s have a closer look at these black engagement ring stones.


What is black sapphire?

First, you may think black sapphire is just a dark blue sapphire.

That is not the case.

Black sapphire is truly black.

It may get mistaken for dark blue sapphires, or black onyx, which is a softer gemstone.

Black onyx is a variety of silicate mineral chalcedony.

It has white, red and brown colored varieties other than black onyx which sometimes gets confused for black sapphire stones.

Black sapphire owes it unique color to the impurities in its crystal structure.

Is black sapphire expensive?

Although it is rarely found, it carries an affordable price tag, less than the price of blue sapphire.

Blue sapphires top the price list thanks to strong demand.

Black sapphires are less in demand.

Nevertheless, the stone price is not the determinant for the sales price of a black sapphire jewelry piece.

A black sapphire engagement ring or wedding band will be priced according to the materials used, its brand, designer and the nature of the collection.

Is black sapphire the same as black star sapphire?

Although they are both black and carry sapphire in their names, these are different gemstones.

Black star sapphire belongs to the group of star sapphires.

These stones have a distinct reflective property: they reflect light in a star shape.

They get special attention for this distinction.

These are very rarely found.

When rarity faces strong demand, there is a price hike.

Thus black star sapphire receives a significantly higher price tag than black sapphire.

black diamond ring

What is black diamond?

Diamonds are not always colorless or yellowish.

There are black colored diamonds too.

It is not a myth.

Black diamonds share the same chemical structure as classic diamonds.

Their color difference comes from the inclusions they have in their structure.

Their cool look brings them a special attention on a wedding ring, earring or wedding band.

There are many designers who include black diamond in their collections for weddings.

Do black diamonds sparkle?

Black diamonds do not sparkle like colorless diamonds because they have many inclusions.

They owe their cool color to these inclusions.

However, they reflect light in many ways thanks to their facets which have different cutting angles.

As a result of their black color and these reflections, they gain a distinct look.

Are black diamonds expensive?

There are different types of black diamonds.

There are naturally found, heat treated and lab created black diamonds.

And of course, price varies accordingly.

Untreated black diamonds gain their color thanks to impurities in their crystal formation.

This is not widely observed case thus it is rarely found.

And when they are found, their color may not be uniform across the stone.

The second group of heat treated diamonds come from low quality diamonds.

These are real diamonds but generally their color is less demanded, or they do have non-homogenous inclusions.

Thus they are chosen to be become black.

Their journey to black color continues with heat treatment.

They gain a uniform opaque color after the heat treatment.

These are the lowest price ones.

The last group which is lab created diamonds are produced in controlled environments to achieve the desired size, shape and color.

Their production time and amounts are all controlled for the sought after results.

Black diamond is harder than black sapphire.

Black diamond tops the Mohs scale with a 10 grade.

Sapphire sits below with a rating of 9.

You can choose either of them with confidence because they are both very durable.

There is a low probability that you’ll encounter a solid object which can scratch them.

In the end, although there are both hard gems, diamond, of course, is harder.

Black diamonds’ price varies significantly depending on their size, shape and origin.

As explained above, there are naturally formed, heat treated and lab-made diamonds.

Beware that a heat-treated natural diamond can be presented as “natural diamond” too.

Without doubt, there is a difference between a untreated black diamond and a treated diamond, which has been made into a full black diamond.


To end with, your final decision will factor in many criteria.

Shape, size, color of the gemstone is a good starting point but there are more to consider in the price of a jewelry.

Base metal and ornaments are important and can change the price considerably.

Think about a gold-plated and a gold vermeil rings both with the same gem.

The gold plated one will include a cheaper alloy inside, while in the vermeil ring, silver is coated with gold.

The latter will command a higher price because of this clear difference.

Lastly, the brand and designer will affect the price.

A renowned designer’s collection pieces will have a more costly price tag.

The brand position and collection will command a premium too.

If the collection is a limited or special edition, we should expect the pieces to be more pricey than usual.