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Journey deep into the heart of the Earth to discover the precious materials that make our jewellery exceptional.

What is a lab-created diamond?

A lab-created diamond is a real diamond. It is not a diamond simulant (e.g. cubic zirconia).

The chemical composition of a lab-created diamond is carbon, just like that of an Earth-created diamond.

It has a hardness score of 10 on the Mohs scale.

It is exactly the same as an Earth-created diamond, except that it is created in a lab.

The grading of a lab-created diamond is the same as an Earth-created diamond (i.e. the 4Cs).


Since lab-created diamonds are not mined, they are considered to be ethical and sustainable.

Forged in the depths of the Earth,
or created by the ingenuity of our own hands,
a diamond is forever.

Solid Gold Grading

It can be easy to get confused with the different terminologies used in gold grading. At Cœur, our modern pieces are set in 18K solid gold, which is the highest grade suitable for holding precious stones. Our traditional betrothal jewellery, also known as 四点金, is set in 24K or 22K solid gold.

We also offer the option to set jewellery in 14K and 10K solid gold or platinum upon request. Please note that we do not craft gold-plated costume jewellery.

The Difference between Fine and Costume Jewellery.

Fine jewellery is made of precious metals, such as solid gold and platinum, and genuine stones, such as diamonds, sapphires, rubies, etc.

Costume jewellery, on the other hand, uses less expensive or simulated stones, such as moissanite and cubic zirconia, as well as gold-plated metals, such as silver. Please note that we do not craft costume jewellery.

Why Is Fine Jewellery More Expensive than Costume Jewellery?

The material cost of diamond simulants and plated metal jewellery is significantly lower than that of fine jewellery. To put things in perspective, the material cost of a cubic zirconia (1-carat diamond equivalent weight) paired with an 18k gold-plated band is less than the cost of 1 gram of pure solid gold.

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