The 4 C's

The 4Cs of Diamond Quality

The universal method for assessing the quality of any diamond, anywhere in the world:





Carat Weight


Until the middle of the twentieth century, there was no agreed-upon standard by which diamonds could be judged. GIA created the first, and now globally accepted standard for describing diamonds: ColorClarityCut and Carat Weight.  The creation of the Diamond 4Cs meant two very important things: diamond quality could be communicated in a universal language, and diamond customers could now know exactly what they were about to purchase.

As creator of the Diamond 4Cs and the International Diamond Grading System™, GIA is not only a global authority, but the world’s trusted source for unbiased assessment.

At Penny Lane Diamonds we only supply full GIA certificated diamonds and only buy and sell the very best of these from H to D colour and from VS to Flawless clarity. We also make sure all our diamonds have ideal cut proportions with no fluorescence, so the colour of your diamond is not effected by different lighting conditions.

Bespoke Service

All Jewellery Handmade to Order

Affordable Prices

We Beat High Street Jewellers on Quality and Price

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