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Different Densities
The carat weight of a gemstone does not necessarily allow you to accurately envision the size of the gemstone. Different gemstones have different densities (mass per unit volume), so two gems that appear to be the same size may actually have very different weights. For example, a ruby is more dense than a diamond, so a 1-carat ruby will look smaller than a 1-carat diamond.

Gemstone Dimensions

round 5mm

square 4mm

oval 4x6mm

pear 4x5mm

To help you envision the gemstone's actual appearance, we at Blue Nile provide the diameter dimensions (for round) or length and width (for other shapes) of a given gemstone. You can even click the zoom button to see a closer look at any piece of gemstone jewelry.