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A 0.58 carat round-cut blue sapphire, flanked by 0.05 carat of D–F VS diamonds, in 18K white gold.
A round sapphire is less common than it looks, and the reason is in the rough. Corundum grows as a barrel or a tapering hexagonal prism, a shape whose widest section is naturally oval. Cutting an oval or a cushion follows that outline and keeps most of the crystal; cutting a true circle means grinding the long axis down to match the short one and losing a substantial share of the weight. Cutters do it only when the material justifies the sacrifice.
What you get for it is symmetry. A round has no long axis, so it presents the same from every direction and never appears to sit crooked on the finger — the small, persistent problem with elongated stones.
The diamonds here are accents rather than a halo: 0.05 carat, set to mark the shoulders and leave the sapphire unenclosed. Blue against unbroken white metal, with no ring of stones between the two.
The same colour with a full halo: 0.55 ct blue sapphire halo ring.
