Diamond Dimensions vs Weight – What Is The Relationship?

I just had a customer contact us to replace a broken 5x3mm emerald cut stone in her eternity ring.  When I described the stone as weighing 0.25ct she commented that she always thought they weighed 0.40ct each.  I thought I’d use this as an opportunity to share a little learning with you about the relationship between the measurements and the weight of a diamond.

Mined diamond crystals are cut for minimum weight loss and every rough diamond crystal is different. So while there are general guidelines to describe the relationship between measurements and weight, there are no exact standard measurements that coincide with a particular weight, especially for fancy shape diamonds like an emerald cut. A mined diamond emerald cut measuring 5x3mm can have a weight between 0.25ct and 0.40ct. The difference between one stone and another will be the depth which can vary and will affect the weight of the stone. We choose to call our Russian Brilliants simulated diamond 5x3mm stone 0.25ct in order to keep the price lower than if we called it 0.40ct. We always try to give our customers the biggest stone possible for their money.

I hope this information is helpful as you research your next fine jewelry purchase. If you have any other questions please do not hesitate to contact us. I’ll do my best to reply.

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