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Your guide to bi-colour sapphires

What is a bi-colour sapphire?

Cornflower and grey round bi-colour sapphire
Champagne and pink cushion bi-colour sapphire
Sky blue and yellow radiant bi-colour sapphire

What colour is a natural sapphire? What colour is a bi-colour sapphire?

Similarly to diamonds, sapphires can be either grown in a lab or grown naturally in the earth over millions of years. The difference with bi-colour sapphires is that they cannot be synthetically produced. These beauties can only occur naturally.

You might be wondering: how does a sapphire get its colour? Classed as a precious gemstone, sapphires are part of the corundum mineral family, meaning they’re composed of aluminium oxide, iron, titanium, chromium, copper and magnesium. When combined under the immense pressure of the earth’s crust, these metals and minerals compress into sapphires. The colour of a sapphire is determined by subtle variations in the amount of each element found in and around the gemstone.

For example, a yellow sapphire is caused by high amounts of iron within the stone. More iron than titanium will create a green corundum stone, while more titanium than iron will give a sapphire a blue shade. 

The location of these different elements and/or the changing composition of the surrounding earth and stone over millennia is what makes the alternating tones within bi-colour sapphires.

Bi-colour or parti sapphires are judged based on their ‘colour zoning’ (the location of the different colours), the colours’ contrast with each other, and their respective saturation. This spectacular variety is what makes parti sapphires such an exciting choice for an engagement ring: they’re as unique as the love story that inspired the ring in the first place.

Are bi colour sapphires rare?

The most common colour pairing amongst bi-colours is green and yellow. Sometimes the two colours will evenly split within a stone, and sometimes they are mottled together like a tortoise shell motif. The rarest combinations are those that contain powder blue, cornflower blue, or purple shades. Some stones have been known to exhibit pink, orange or silver tones as well, and these are especially desirable because of their sunset-like tonality.

Forest green, yellow, and sage round bi-colour sapphire
Teal and green cushion bi-colour sapphire
Royal blue and silver baguette bi-colour sapphire

Is a bi-colour sapphire a good choice for an engagement ring?

The short answer: 100% yes.

But despite their dreamy, one-of-a-kind appearance, bi-colour sapphires remain relatively unknown within the jewellery market. However the popularity of coloured gemstones has spiked recently, making them one of the top engagement ring trends of the past year. Could this golden age of colourful wedding jewellery finally allow bi-colour sapphires to take centre stage?

Sapphires are an incredibly durable gemstone, making them ideal for everyday wear. In fact, sapphires score a 9 on the Mohs mineral hardness scale (a measure of the resistance of materials against scratches of harder materials), meaning they’re second only to diamonds in terms of durability. You can be confident that your parti sapphire engagement ring will last a lifetime.

When choosing a bi-colour sapphire it’s best to work with a gemstone expert or jewellery designer in order to find a stone with the most suitable cut for your design, along with the best colour pattern. Another interesting thing about bi-colour sapphires is that they’re commonly cut in artistic and creative shapes—more so than their single tone counterparts. This is because a cutter will study a rough bi-colour sapphire’s colour pattern and cut the stone to best feature the colours rather than retaining the most carat weight.

This bi-colour sapphire features a subtle combination of blue, green and chartreuse

Looking to create a custom bi-colour sapphire engagement ring? Get in touch with our team of design specialists who can help you find your dream gemstone and talk you through all the ins and outs of making a personalised coloured gemstone ring.

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