The icon is designed as a hypothetically producible piece of jewelry, except that the corners — those tiny semi-spheres that hold the gems — are a bit larger to accommodate the icon’s scale. The piece has a partially open back to allow for more light to reach the gems. That makes them look prettier both in renders and irl.
Front view, back view

The model was created in Rhino and later welded and polished in ZBrush to make it appear closer to how it would look in real life.
zBrush smoothing