Cullen Curated
A signature range of lab grown gemstones by Cullen Jewellery
Expertly Curated By Hand
Cullen Curated by Cullen Jewellery, is a signature range of lab grown gemstones that are hand-selected for their unmatched colour, clarity and superior cut. Our gemstones are grown in controlled environments using advanced technology and strict quality control. This results in high-quality, responsible, lab grown gemstones free from the ethical concerns of mining.
Our Curation Process
SOURCING
We work with the most advanced gemstone-growing labs worldwide to ensure we offer the highest quality available.
GRADING
We inspect every stone to ensure it meets our grading criteria. Not every stone makes the cut.
ASSURANCE
We stand behind our curation process by offering a limited lifetime warranty on all Cullen Curated gemstones.
Our Gemstones
The Cullen Jewellery Gem Vault
It takes an eye for detail to select the perfect gemstones for engagement rings and fine jewellery. Cullen Curated gemstones are carefully chosen by our experienced jewellers, who together bring a combined 100 years of gemology expertise to the stringent selection process.
All Cullen Curated gemstones are grown in controlled laboratory environments. The result is an unparalleled collection of heirloom lab grown diamonds and gemstones that are kind to our world.
Lab Grown Sapphires
Cullen Curated Lab-grown sapphires are primarily composed of the mineral corundum (aluminium oxide) and are prized for their remarkable hardness (9 on the Mohs scale) and vivid colouration.
They are Identical in chemical composition, crystal structure, and physical properties to mined sapphires.
Growing Process
Cullen Curated sapphires are grown using the Czochralski Process. In this process, aluminium oxide is melted using radio waves, and a rod with a seed crystal is inserted into the mixture. As the rod is slowly rotated and pulled out, a column of sapphire forms. This method is more expensive than others but it allows for precise control over the crystal's growth, resulting in high-quality sapphires.
SAPPHIRE PROPERTIES
| CHEMICAL COMPOSITION | Al203 (Aluminium Oxide) |
| HARDNESS | 9 on the Mohs scale |
| REFRACTIVE INDEX | 1.76 - 1.77 |
| SPECIFIC GRAVITY | 3.95 - 4.03 |
| CLARITY | Eye clean |
| ORIGIN | Lab Grown |
| AVAILABLE COLOURS | Blue, pink, purple and red. |
Lab Grown Moissanite
Cullen Curated Lab-grown mosssanite is composed of silicon carbide and is prized for their remarkable hardness (9.25 on the Mohs scale) and exceptional fire and brilliance.
Growing Process
Cullen Curated moissanite is grown using the Physical Vapour Transport (PVT) process. This intricate method involves sublimating silicon carbide in a vacuum, transforming it into a vapour that delicately deposits onto a seed crystal. The process starts by heating silicon carbide powder in a graphite crucible at high temperatures, causing it to sublime in a vacuum. The silicon carbide vapour then moves to a cooler part of the crucible, where it settles onto a seed crystal, forming a brilliant moissanite gem.
MOISSANITE PROPERTIES
| CHEMICAL COMPOSITION | SiC (Silicon Carbide) |
| HARDNESS | 9.25 on the Mohs scale |
| REFRACTIVE INDEX | 2.65 - 2.69 |
| SPECIFIC GRAVITY | 3.22 |
| CLARITY | VVS1 - VVS2 |
| ORIGIN | Lab Grown |
| AVAILABLE COLOURS | Colourless, Green, Grey, Yellow, Champagne, Blue |
Certification
Every Cullen Curated lab-grown gemstone comes with a digital certification, providing a detailed record of its unique characteristics.
You can access your
certification in your Client Portal
Limited Lifetime Warranty
All Cullen Curated lab grown gemstones are guaranteed to be of the highest quality through a limited lifetime warranty.
COVERAGE
- The brilliance and fire inherent in your lab grown gemstone(s).
- The coverage for your Cullen Curated gemstone(s) is subject to the terms outlined below and set forth on your Limited Lifetime Warranty Certificate.
TERMS AND CONDITIONS
If your gemstone(s) optical properties of brilliance and fire alter in the unlikely event, please contact us immediately.
- The Limited Lifetime Warranty applies only to the original purchaser and is non-transferable
- The Limited Lifetime Warranty on your gemstone(s) does not cover: chipping, breaking, scratching, abrasions, or damage as a result of abuse, misuse, loss, or theft of your gemstone(s).
- Cullen Jewellery does not endorse or approve any third-party alterations or treatments to any Cullen Curated gemstones. Such processes may be temporary and could lessen the durability and value of the gemstone(s). Accordingly, any third-party alterations or treatments will void the Cullen Curated Limited Lifetime Warranty.
- Any third-party alterations or treatments to your gem(s) will void your warranty.
Cullen Jewellery is dedicated to delivering exceptional and socially responsible gemstones that last a lifetime.
Expert Guidance
selecting and acquiring the ideal stone.
Lab grown gemstones share the identical chemical composition and captivating sparkle of mined gemstones. Grown in controlled environments with cutting-edge technology, they eliminate the need for mining, ensuring their origins are both traceable and responsible.Compared to mined gemstones, lab-grown stones boast a smaller carbon footprint and environmental impact. Opting for fine jewellery crafted with lab-grown gemstones represents a conscientious and responsible choice.
Cullen Curated lab grown gemstones are hand-selected for exceptional colour, clarity, and cut. They are grown using advanced technology and strict quality control. By being brown in a controlled lab environment, they are free from the ethical concerns of mining."
In the rare instance that you need to claim your limited lifetime warranty on your Cullen Curated lab grown gemstone, please contact us here.
Lab grown and mined sapphires are identical twins in terms of chemical composition, crystal structure, and physical properties. The key difference is their origin: lab grown sapphires are born in controlled environments, while mined sapphires are formed over millions of years in the Earth's crust.
When choosing between moissanite and diamonds, both gems offer unique strengths. Moissanite is known to be an accessible option with brilliant sparkle due to its higher refractive index. Diamonds, on the other hand, have a timeless appeal and are often seen as symbols of enduring love and tradition. Both stones boast remarkable durability, making them perfect for any jewellery piece.