Sapphires Fact Sheet

0. Cullen Jewellery Sapphires Launch

• It's Rounds are Portuguese cut - images are of our exact stones
• Both Ruby and Sapphire are Corundum. Sapphire and rubies are just trade names, with sapphire usually referring to blue and rubies referring to red stones
• Currently the Sapphires have no certification or unique identifiers. This will be confirmed in the coming days with Radiant Beauty.

1. Introduction to Lab Grown Sapphires

Sapphires, primarily composed of the mineral corundum (aluminium oxide), are prized gemstones renowned for their remarkable hardness (9 on the Mohs scale) and vivid colouration.

As with moissanite, corundum does not have cleavage planes. This is what can cause diamonds to crack, and therefore, sapphires can be stronger at absorbing the impact of a knock. This toughness or resistance to breaking is referred to as tenacity.

Lab grown sapphires are created in controlled environments using technological processes that mimic mined sapphire formation. They are Identical in chemical composition, crystal structure, and physical properties to mined sapphires.

2. Creation Process

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 can yield up to 4 inches of crystal per hour. It allows for precise control over the crystal's growth, resulting in high-quality sapphires.

3. Properties

Chemical Composition: Al2O3 (Aluminum Oxide)

Hardness: 9 on the Mohs scale

Refractive Index: 1.76 - 1.77

Specific Gravity: 3.95 - 4.03

Cullen Jewellery Sapphires

• Clarity: Eye Clean
• Origin: Lab Grown
• Colours Available**:** Blue, pink, purple, and red.