How Much Does a Lab-Grown Diamond Engagement Ring Cost in Australia? (2026 Price Guide)

Buying an engagement ring should be an exciting experience, but deciding how much to spend can be tricky.

Lab-grown diamonds are a great choice for an engagement ring. Although prices vary depending on different factors, lab-grown diamonds are chemically, physically and optically identical to natural diamonds. They also tend to cost less.

This engagement ring price guide looks at the cost of lab-grown diamond rings, including examples from Siara by Ark and other Australian jewellers. We’ll also explain what to look out for when choosing a ring.

1. How Much Do Lab-Grown Diamond Engagement Rings Cost in Australia?

If you're researching the lab grown diamond engagement ring cost in Australia, it's worth knowing that prices vary depending on several factors, including the diamond's size, cut, colour, clarity and the setting you choose.

Some of the engagement rings from Siara by Ark start from A$1,199. For example, the Tash Asscher Engagement Ring starts at A$1,199, while the Lama Oval Engagement Ring starts at A$1,300. The Lisha Oval and Cleo Round Engagement Rings start at A$1,400.

They also have some higher-priced rings, such as the Bloom Oval Engagement Ring at A$2,700, the Tia Oval Engagement Ring Set at A$3,000, and the Alla Oval Engagement Ring Set from A$3,250.

This shows that these rings are not all the same price. Some are listed with starting prices, and the final cost will also depend on the metal and other factors. Be sure to check whether the item is an individual ring or a set with a matching band.

When comparing lab grown diamond ring prices Australia jewellers advertise, take a look at the details of the centre stone, metal, extra stones and what comes with the product.

2. How the 4Cs Affect the Price

The cut, colour, clarity and carat are all main factors used to describe a diamond’s quality. Understanding these can help you know what to look for when buying a diamond.

Siara by Ark engagement rings use lab-grown diamonds with independent certification. You’ll be able to see how the diamond is graded on its certificate, so knowing these factors will help you compare different options.

Cut

The cut of a diamond will impact how much light reflects off it. A well-cut diamond can be very bright and lively. However, not all diamonds are well cut, so some may not reflect light as well.

When looking at different rings, don’t just look at how big the centre stone is. Take a look at how well it is cut and its proportions. A well-cut diamond can make a ring look more appealing than a larger diamond with a less impressive cut.

Colour

The colour grade shows how colourless the diamond is. Diamonds range from D, which is colourless, to grades with more noticeable colour.

A higher colour grade can affect the price. However, you might still want to go for a slightly lower grade. It can still look beautiful!

Clarity

Clarity indicates how many inclusions and blemishes there are inside or on the surface of a diamond. These are assessed using magnification.

Diamonds with a higher clarity grade tend to be more expensive. However, you might not notice much difference with the naked eye. Be sure to look at the grading report before making a decision.

Carat

The weight of a diamond is measured in carats. Generally, the bigger the diamond, the more expensive it will be. However, the cut, colour and clarity will also impact the price.

You might want to go for a larger centre stone, but there are different ways to make a ring stand out. The shape and setting can also affect how big the diamond looks.

3. How the Setting and Metal Affect the Price

Aside from the centre stone, the setting and metal will impact the price.

Solitaire settings have one central stone, giving the ring a simple and classic look. This is a popular choice for making the centre stone stand out.

Pavé settings have small stones along the band of the ring. Hidden halo settings have small stones underneath the central stone, while bezel settings hold the diamond in place with a metal rim.

More intricate designs will require more materials and work. If the ring has extra stones or a wider band, this could increase the price.

The metal can have an impact too. Carats are often used to show how pure gold is. 9K, 14K and 18K gold have different amounts of gold, which can affect their price. Some jewellers offer gold in different colours, such as yellow, white and rose gold, while others also offer platinum.

Some rings have different metals available. For example, the Tash Asscher Engagement Ring from Siara by Ark has options for 9K, 14K and 18K gold. Be sure to check what metal is available for your favourite ring. Changing the metal may impact the price.

Also, consider how you will be wearing your ring. A low setting might be better if you use your hands a lot, whereas a high setting will make the centre stone stand out more. Choose something that will be comfortable for you.

4. Sample Lab-Grown Diamond Ring Budgets in Australia

Having a budget in mind when shopping can help you narrow down what you are looking for, it can also help you decide which features matter most.

Here are some examples of lab-grown diamond ring prices from Australian jewellers:

• Approximately A$2,800–A$3,100: Maker+Stone has a range of one-carat lab-grown diamond engagement rings in 18K gold. The Roma round solitaire starts from A$2,828, while some Paris designs are listed at just over A$3,000.
• Approximately A$2,950–A$4,350: Lily Dia has a range of complete one-carat lab-grown diamond engagement rings in 18K gold. These have centre stones of approximately 1.00–1.09 carats, E–F colour grades and VVS1 clarity. They also come with an IGI report.
• Approximately A$3,000–A$6,000: Anny’s gives this as a typical price range for a complete lab-grown diamond engagement ring. This includes the centre stone, metal and setting.

These examples are from individual jewellers in Australia. Different rings will have different specifications, designs and inclusions, so be sure to compare the details.

Also, check whether the diamond is loose. Anny’s has one-carat lab-grown round diamonds from approximately A$1,511. This is for the centre stone only. You would still need to add the setting and metal.

When comparing prices, look at the centre stone, grading, metal, setting and whether the price is for a complete ring. Just because one ring has a lower starting price doesn’t necessarily mean the finished ring will be cheaper.

5. Questions to Ask Before Buying a Lab-Grown Diamond Ring

Take your time when choosing a ring to ensure you know all the details. Here are some questions worth asking before making a purchase.

Does the diamond come with a grading certificate?

Ask which independent laboratory has graded the diamond. Will you receive a grading report? Siara by Ark uses independently certified lab-grown diamonds. Check that the grading details match the diamond in your chosen ring.

What are the 4Cs of the diamond?

Ask about the cut, colour, clarity and carat of the diamond. This will help you compare rings that might look similar in photographs but have different specifications.

What metal is it?

Be sure to check what metal the ring is available in. For example, is it 9K, 14K or 18K gold, or platinum? Check what colours are available too. Will your choice affect the price?

Is it a bespoke ring?

Ask how long it will take to make the ring. Can the jeweller have it ready by your desired date? Siara has a standard turnaround time of approximately two weeks after order confirmation. Bespoke designs can take longer.

What does the warranty cover?

Read through the warranty details. Siara advertises a lifetime warranty, but be sure to check what is covered and whether there are any conditions.

Can I return or exchange the ring?

Be sure to check the returns policy. Siara has a 30-day return or exchange policy for eligible non-personalised items. Bespoke items may have different terms.

Finding an Engagement Ring That Fits Your Budget

You don’t always need the most expensive engagement ring. You want to ensure it has a good-quality diamond, a nice design, fits your budget and is comfortable to wear.

Siara by Ark has a range of IGI-certified lab-grown diamond engagement rings, with a variety of styles to choose from. Take a look through the collection and compare the options. You can also get in touch with the team if you need help.

With the right information, you can find a style that feels special and fits your budget.