Everything you need to know about Moissanite and Lab Diamonds


If you have any questions at all that we do not cover below please get in touch via our Contact Us page. 

Customer Care FAQs

Once you are completely happy with your design and have sent through your approval, we will begin crafting your custom ring. All our rings are made to order and are usually ready in 5-7 weeks. Read more

If you need help placing an online order, please send an email to sales@cullenjewellery.com and one of our friendly team members will get in touch with you. Alternatively, feel free to call us on 1300 977 619.

Cullen Jewellery offers a free Lifetime Warranty from the date of invoice against any manufacturing defects on all gold and platinum jewellery. Read more about our full warranty terms and conditions here.

Yes! At Cullen Jewellery we offer free international shipping on all orders.

Absolutely! We understand that many of our products are purchased as surprise gifts for events such as an engagement. For this reason, we use subtle packaging that will not give away the contents of the package.

Please let us know if we can help you in any other way to keep your purchase a surprise!

At Cullen Jewellery, we accept payments via direct debit, cash or card. If you are looking for an extended payment plan, we also offer interest-free finance via Humm.

Showroom visitation is by appointment only. Conveniently situated in Kew (Melbourne), our showroom features a display of our most popular rings, as well as a large range of lab diamond and moissanite loose stones.

Our showroom is open from Monday to Friday 9am – 5pm and on Saturdays from 8am – 4pm. Our showroom is closed on Sundays.

You can book a showroom appointment here!

Since all Cullen Jewellery rings are custom made to order, they cannot be returned. To ensure your satisfaction with your custom ring design, we always send through a detailed computer design for approval before we begin crafting your ring.

For information on returning loose stones or other jewellery to Cullen Jewellery, you can view our Returns Policy here.

At Cullen Jewellery, we offer free ring sizers so you can measure your ring size in the comfort of your own home! Simply fill out this form and allow up to 4 working days for your free ring sizer to arrive.

Absolutely! All Cullen Jewellery rings come with one free resizing within the first six months of purchase. *Free resize to maximum of 2 sizes up or down. Not available on all rings, please confirm before purchase. Read more about resizing.

Lab Grown Diamond FAQ's

Yes! Lab grown diamonds are just as real as mined diamonds.

With the exact same optical, chemical, thermal and physical properties, the only difference between lab diamonds and mined diamonds is their origin. Lab diamonds are grown in controlled laboratory environments that produce the same pressure and heat conditions that form mined diamonds in the earth's crust.

Lab grown diamonds are completely different to diamond simulants. Simulant diamonds are manufactured to look like a real diamond, but are made from totally different materials. The most well-known simulant is cubic zirconia (CZ) which is a crystal form of zirconium oxide. Lab grown diamonds are made from actual carbon atoms arranged in the characteristic diamond crystal structure - making them 100% real diamonds!

A lab grown diamond has the same chemical and physical properties as a diamond while a simulant is made of a different material, designed to simply mimic the appearance of a diamond. One of the most well-known simulants is cubic zirconia which is made from a soft substance called zirconium dioxide. Simulant diamonds will not have the same longevity as real diamonds and will need to be replaced every few years. Lab grown diamonds are just diamonds, with their origins being the only distinguishable difference. Lab and mined diamonds are both made of pure carbon and hold a hardness rating of 10 on the Mohs hardness scale. A lab diamond will last just as long as a mined diamond.

Lab grown diamonds are an excellent alternative to mined diamonds as they provide much more value. Without sacrificing quality for price, lab diamonds will be more affordable than mined diamonds of the same quality and size.

Just like their mined counterparts, every lab created diamond is unique. Grown under the same intense heat and pressure as a mined diamond, a lab diamond undergoes the same growth process and may still contain minor internal or surface imperfections like a mined diamond will. This means every lab diamond will vary in colour, clarity and cut. Expert gemological labs such as the IGI and GIA evaluate and certify every single lab created diamond using the same strict standards applied to mined diamonds.

Absolutely not! Since lab diamonds have the exact same physical and chemical properties as mined diamonds, they are just as durable and scratch-resistant, meaning they will never become cloudy.

Since lab diamonds are grown in controlled laboratory environments, they do not need to be extracted from the earth like their mined counterparts. By removing the need for mining, lab diamonds reduce the impact on the environment and eradicate the risk of unethical labour practices and community displacement.

Scientists have attempted to grow diamonds in a laboratory since the late 1800s. The first company to successfully produce large quantities of lab diamonds was General Electric in the 1950s. However, these were largely created for industrial use and were not suitable to be worn in fine jewellery. Gem quality lab diamonds have only been available from the late 1980s.

Yes, lab grown diamonds will pass a diamond tester. Since lab grown diamonds are made of pure carbon and have the same thermal conductivity and chemical properties as real diamonds, they will record a positive test on a diamond tester.

To ensure consistency of certification, every lab created diamond is inspected and certified by a gemological expert at the IGI. Using a very fine and precise laser beam, every lab diamond is inscribed with the report number and the words “lab grown”, assuring you of your diamond’s origin and authentic certification. This inscription is invisible to the naked eye and can only be seen under a jeweller’s loupe. In no way will this impact your diamond’s quality or light performance.

Absolutely! All of our lab diamonds are evaluated on cut, clarity, colour and carat weight and are IGI or GIA certified. Most of our lab diamonds are certified by the leading lab-grown gemological institute, IGI. The IGI is the most popular lab-created diamond certifier and is used by most of the lab market, creating a consistency in grading across the lab diamond industry. This allows the consumers to easily compare lab diamonds and to be assured they’re getting what they’re paying for.

Lab diamonds are produced in controlled laboratory environments and do not need to be mined from the earth. Unlike mined diamonds, only lab created diamonds can be 100% conflict-free. It is near impossible to know the origins of a mined diamond and whether unsafe or unethical labour practices were involved in its extraction from the earth.

Lab diamonds are the eco-friendly alternative to mined diamonds. Did you know that over 250 tons of ore must be moved just to mine 1 carat of mined diamond? By removing the need for mining, lab diamonds reduce the devastating impact on the environment and ensure natural habitats, fauna and ancestral communities were unharmed in their production.

No, we do not sell mined diamonds. At Cullen Jewellery, we are committed to ensuring all of our diamonds come 100% conflict-free. Lab created diamonds are the only diamonds that can be fully traced to their origin, allowing us to deliver ethical, environmentally-friendly jewellery to our customers, every time.

Moissanite FAQ's

Moissanite is worth buying for its lasting beauty, cost-effectiveness and conflict-free origins. As a lab-created stone, moissanite involves no mining and its origins can be easily traced, making this a sustainable choice of gemstone. Moissanite is significantly lower in price than diamonds of the same size and quality, allowing you to purchase your dream ring for a fraction of the price! With a high clarity grade and a hardness rating of 9.25-9.5 (second only to a diamond at 10), your moissanite stone is extremely durable and will retain its sparkle throughout everyday wear. At Cullen Jewellery, we are so sure of this that we provide a lifetime warranty to guarantee the lasting brilliance, colour and clarity of your gorgeous gemstone. Read more

Yes, moissanite will pass a diamond tester. Moissanite and diamonds conduct heat in very similar ways, and since diamond testers measure thermal conductivity, moissanite passes as a diamond. A specific Moissanite tester that uses electrical conductivity can be used to distinguish the difference between a moissanite and a diamond. However, the easiest way to differentiate between a diamond and moissanite is to use a loupe to look through the top of the jewel at an angle. Moissanite stones will show two slightly blurred lines, indicating a double refraction – this is moissanite’s unique attribute. Read more

Moissanite is not a fake diamond, but a real, beautiful gemstone in its own right. Although often compared to a diamond for its similar appearance, moissanite is a lab-created stone with high clarity, hardness and fire. Unlike cubic zirconia, which is a man-made stone used for fake diamonds, moissanite is extremely durable and is suitable for a lifetime of everyday wear. The dazzling sparkle and lasting beauty of moissanite makes it the perfect alternative for customers who want a look similar to a diamond without the expensive price tag or questionable ethics. Read more

Absolutely not! Due to its diamond-like appearance, many people believe the misconception that moissanite is a fake diamond when it is in fact a high quality, beautiful gemstone in its own right. Moissanite is becoming an increasingly popular choice of stone in engagement rings due to its dazzling beauty, durability, ease of customisation and affordability. Read more

While moissanite has a diamond-like appearance, it is not a fake diamond and is in fact a beautiful, unique gemstone. When light hits a moissanite ring, the surface of the stone sparkles with a rainbow, almost disco ball effect. This makes moissanite more vibrant than a diamond, but it is not to the point of looking fake. The sparkle and fire of moissanite is what attracts moissanite lovers and here at Cullen Jewellery, we say the more sparkle the better! Read more

No, moissanite does not lose its sparkle. Due to its superior hardness, clarity and refractive index, moissanite will remain bright and sparkly forever. Over time, oils and dirt can build up on the surface of your stone but this can be easily cleaned away either by a professional or at home. At Cullen Jewellery, we guarantee your moissanite’s lasting brilliance, clarity and colour with a lifetime warranty – so you never have to worry about your moissanite losing its shine! Read More

A moissanite diamond does not exist. Despite having a similar appearance to a diamond, a moissanite is a real, beautiful gemstone all its own. First discovered in a meteor crater by Henry Moissan in 1893, moissanite is now produced in labs, making this gem both affordable and ethical. Moissanite stones are bright and eye-catching, with a high clarity grade, colourless beauty and sparkling fire. With a hardness rating of 9.25-9.5, moissanite is incredibly durable and is guaranteed to outlast a lifetime of daily wear. Available in a variety of sizes and shapes, moissanite provides buyers with more freedom for custom designs and can be purchased for the fraction of the price of a diamond of the same size and quality. Read more

At Cullen Jewellery, we believe the best moissanite brand to buy is Radiant Beauty. Radiant Beauty is an Australian company that ensures their moissanite has been expertly crafted and graded and can be traced back to the manufacturer. As our sole source of moissanite gemstones, Radiant Beauty give us the confidence and ability to provide lifetime warranties on all of our stones. When you purchase high-quality branded, Australian made jewellery, you can be confident that your piece will hold strong and sparkle for a lifetime! More about Radiant Beauty

Yes, you can shower with a moissanite ring. However, the more you come in contact with soaps, dirt and chemicals, the faster oils and dirt can build up on the surface of your ring.This can be easily cleaned off but to ensure a longer-lasting sparkle, we recommend avoiding washing dishes or doing heavy housework whilst wearing your ring. Read more about how to care for your moissanite ring

Due to low levels of regulation in the moissanite industry, it is easy for low quality, unbranded stones to flood the market. Though often sold at cheaper prices, these stones come from unknown sources and are vastly inferior in colour and cut. To guarantee the beauty, quality and authenticity of your moissanite, you should only consider purchasing branded moissanite from reputable companies. At Cullen Jewellery, we source all of our stones from Radiant Beauty, an Australian company that ensures their moissanite is professionally manufactured, carefully selected and graded by experts.

No, you can't scratch moissanite. As it is one of the most durable substances on earth, moissanite is highly resistant to scratching or breaking. With a hardness rating of 9.25 – 9.5, moissanite is harder than all other gemstones besides diamonds, and can only be scratched by a diamond or another moissanite stone – which is unlikely to occur! Read More

Getting a moissanite engagement ring is one of the best gifts you could ever receive! Though similar to a diamond in appearance, moissanite is a unique, standalone gemstone – Like lab diamonds, it is an ethical, sustainable and affordable engagement ring choice. Not only does moissanite have a unique extra sparkle, it is also extremely durable and is suitable for a lifetime of daily wear. The lasting durability, beauty and sustainability of moissanite makes it a popular choice for those who want to make responsible, cost-effective jewellery choices without sacrificing on quality. Read more

A 1 carat moissanite is worth approximately $990 AUD but will vary depending on the cut of your stone. You can find pricing for moissanite loose stones of every shape and size here.