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A loose sapphire gemstone faces to the left across from a loose diamond gemstone facing to the right

Sapphire vs. Diamond: Which One Suits You?

Both diamonds and sapphires are stunning and popular choices for engagement rings, earrings, necklaces and other types of jewellery. They both come in a beautiful range of hues and are exceptionally durable, making them ideal stones for everyday wear. There are some distinctive differences between sapphires and diamonds that make these stones unique.
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Origins, History and Rarity

It’s true that diamonds are rare and precious stones, but it’s the distinct colour, clarity, carat and cut of each particular diamond that defines its individuality. Diamonds have been mined for over two millennia, with the first stones coming from India. Now, diamonds are found around the world, with the majority sourced in Canada, Australia, Africa and Russia. There are also lab-made diamonds entering the jewellery space.

Diamonds have historically commanded attention as priceless shining stones. Starting in India’s rivers and streams during the 4th century, diamonds found their way to Europe where they were the elite’s favourite fashion starting in the 1400s. Since then, diamond demand has exploded globally and the trade has been reformed with conflict-free diamonds.

Sapphires are made of the mineral corundum, and high-quality sapphires can be even rarer than diamonds. They are also mined around the world, with notable mines in South-East and Central Asia, Australia, Africa and the U.S. in Montana. Traditionally, sapphires are available in blue and white, though additional colours are available.

Historically, sapphires have been worn by royalty for centuries. Ancient Greek and Roman kings and queens would use blue sapphires to protect themselves from harm.


Clear, radiant diamonds and cool, blue sapphires are highly recognisable gemstones. However, both of these stones come in a wide array of colours and offer an eye-catching variety in appearance.

When comparing white sapphires to more colourless diamonds, there are some main differences between these two stones. Diamonds will typically appear more sparkly than sapphires of similar qualities because of the differences in how these stones reflect light. In smaller sizes, the differences are typically less apparent.


Diamonds possess a signature sparkle, thanks to their high rating on the refractive index. They brilliantly reflect white light and split it into a dazzling spectrum of colours, creating a striking fire.

Sapphires feature a more subtle sparkle and a lower rating on the refractive index. A high-quality cut is important for maximizing a sapphire’s sparkle. Keeping your stone clean is also key for making sure it looks its best as it catches the light.

A diamond will sparkle with more colours and intensity while a white sapphire will more likely return a silver, milky sparkle.


Gemstone colour is an important factor in choosing jewellery you love. Diamonds are well-known as glistening clear stones, but they are available in a dazzling array of hues, including blue—although this colour is uncommon for diamonds. Blue diamonds are formed when traces of boron lend a blue tone to the diamond’s carbon make-up. This blue hue can range greatly in tone, from dark grey to mesmerizing shades of aqua.

Sapphires are acclaimed for their azure blue hues, but they are available in almost any colour. There are even sapphires that change colour under different lighting conditions. This variety makes sapphires ideal stones if the wearer craves a ring in a statement colour. Sapphires are not available in red hues, though, as red sapphires are classified as rubies. Saturation indicates the vibrance of a sapphire, with higher saturation often increasing the value of the stone.

When comparing colours in sapphires vs diamonds, the white-toned stones are often compared. Colourless diamonds and white sapphires can have a lot of similarities in terms of the hues of these stones. The largest differences in white sapphires and diamonds are the brilliance and clarity of these stones. Diamonds will typically provide more brilliance and clarity.


Gemstone clarity is one of the key elements in the appearance of a gemstone. Diamonds are graded for clarity using an 11-grade scale provided by the Gemmological Institute of America. Diamonds ranked flawless are exceptionally rare. Most diamonds are ranked as Very Slightly Included (VS) or Slightly Included (SI). These diamonds have minimal inclusions that typically can be detected only by a trained grader with 10x magnification.

Sapphires generally have some inclusions. Stones featuring exceptional clarity are very valuable and hard to come across. However, some inclusions can increase the value of a sapphire. Silk inclusions, which appear as small, needle-like lines, can create a star effect, while other inclusions can give a sapphire a beautiful velvet-like appearance.

Hardness & Wearability

Diamonds score a perfect 10 on the Mohs scale and are the hardest substance in the world. They cannot be scratched, except by another diamond, making them a wonderful choice for everyday wear. It is still possible to damage or crack a diamond when it is hit, though, so it’s a good habit to remove your ring when doing rough, hands-on tasks.

Sapphires feature a high score of 9 on the Mohs scale, making them exceptionally hard and an ideal choice for everyday wear as well.


A variety of gemstone enhancements can be used on diamonds to emphasise their colour or enhance their clarity. Irradiation, high pressure, high temperature (HPHT) and coatings are all treatments that can adjust a diamond’s colour. Fracture filling can minimise the appearance of white fractures in a diamond. Laser drilling to remove imperfections can improve the look of a diamond’s clarity.

The most common treatment for sapphires is heat to emphasise their colour and reduce the appearance of inclusions for increased clarity.

Meanings and Symbolism

Diamonds are a classic symbol of love everlasting. As the world’s hardest substance, they carry a sense of timelessness and strength. Clear stones also symbolize purity.

Sapphires are often equated with knowledge and wisdom and are a symbol of good choices, adding to their significance as an engagement stone. They also are thought to connect you to the universe and bring good fortune into your relationship.

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Popular Ring Styles and Settings

Diamonds are beautifully versatile and look stunning in a wide range of cuts. The best cut for a stone allows optimal light reflection and suits its natural shape and qualities. A classic round cut is a favourite, as it highlights the sparkle of the highly refractive stone, but there are plenty of stunning options to choose from when looking for the ideal diamond.

Sapphires also come in a beautiful variety of cuts, with the most popular being round, oval and cushion cuts. The best cuts are designed to flatter the natural balance of the stone and give it an even look.

Both diamonds and sapphires look lovely in an array of different settings, so there’s plenty of room to let your creativity come to life when deciding on an ideal style. Select a solitaire-set stone to make a timeless statement, choose a pavé or halo setting to accentuate the main stone with dramatic shimmer, or opt for beautiful accent stones.

Sapphire vs Diamond Weight

When looking at sapphire vs diamond weight, there are major differences between these two stones. Carat refers to the weight of a gemstone and is often used to determine stone size. Sapphires are typically denser than diamonds, giving them a heavier carat weight for a visually smaller stone. A 1 carat sapphire will look smaller than a 1 carat diamond of a similar cut due to the increased density of sapphires.

Chemical Differences

Diamonds are made of carbon that has been exposed to incredible pressure and heat, resulting in an isometric atom structure that helps give diamonds their hardness.

Sapphires are chemically different from diamonds, featuring corundum that contains only oxygen and aluminum. The environment where sapphires grow is very uncommon, as the oxygen and aluminum must combine without any silicon present. This makes sapphires rarer than diamonds.

Sapphire vs Diamond Price

Though sapphires are rarer than diamonds, they are often a more affordable diamond alternative or accent. The brilliance, durability and timelessness of diamonds keeps them as the more expensive of these two gems. A diamond of similar carat, cut and quality will cost more than a comparable sapphire.

Popularity of Diamonds vs Sapphires

The sapphire vs diamond debate has been continuing for years, with people enjoying the beauty of both these stones. Sapphires are growing in popularity for all jewellery types, including sapphire engagement rings. Many pieces also combine sapphires and diamonds into one beautiful design.

Caring for Your Diamond or Blue Sapphire Jewellery

  • Regular maintenance can help keep your ring looking its best for generations to come.
  • Routine gemstone cleaning keeps any stone bright and sparkling, and it provides an opportunity to check for loose stones.

Blue Nile Promise

Whether you’re seeking a dreamy blue sapphire, a fiery diamond, or you're still seeking information about other gemstones to create the perfect ring, we’re here to help. From complimentary ring sizing to free returns, we have a variety of services to ensure you’re as thrilled with your ring as you should be. We also offer complimentary cleaning services, once you’ve found the right ring, to help you keep it looking as stunning as when you first saw it.

Sapphire vs Diamond FAQs

No, a sapphire is not a diamond. Diamonds are made from carbon while sapphires are a mineral known as corundum. They have uniquely different chemical compositions and styles.

Sapphires and diamonds both bring their own features and benefits. The “better” stone is the one that meets your budget and style.

When comparing sapphires vs diamonds price, diamonds are the more expensive stone. Though sapphires are rarer than diamonds, they are less expensive.

Sapphires and diamonds typically come in different colours. When comparing similarly coloured stones, such as white sapphires vs diamonds, brilliance is one of the best ways to differentiate between the two. A diamond will return a brilliant, fiery sparkle while the brilliance of sapphires is more often a milky sparkle.

Sapphires require regular cleaning to stay at their best sparkle. Polishing the sapphire and cleaning off any buildup with a jewellery cleaning solution will keep the stone at its best.

How Do Other Gemstones Compare to Diamonds?

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