Diamond shape guide

Oval Diamond Guide

Elegant, elongated and full of brilliance.

What makes a good oval diamond?

The biggest visual variable is often the bow tie: a dark band across the center caused by the way the stone returns and blocks light. Some contrast is normal; a heavy, persistent bow tie can dominate the stone.

Proportions and face-up size

Length-to-width ratio describes the outline, not quality. Many buyers prefer roughly 1.35–1.50, but preference varies and visual balance matters more than hitting a formula.

Carat is a weight measurement. Use the listed millimeter dimensions to understand how large the diamond will look from the top and to detect stones that carry more of their weight in depth.

Color and clarity

Brilliant faceting can mask inclusions reasonably well, but elongated stones may show color differently toward the ends. Inspect the actual video.

For color, compare nearby grades in the same shape and approximate size. The setting metal and the amount of body color your own eye notices are more practical than chasing a grade for status alone.

What to inspect in 360° video

• Whether the diamond stays lively as it rotates rather than going dark for long periods.
• Whether the contrast pattern looks balanced.
• Any central or dark inclusions that remain obvious at normal scale.
• Outline symmetry and whether the shape looks pleasing from straight on.
• For fancy shapes, any bow tie, windowing or uneven brightness.

Best buying strategy

1. Set a carat and millimeter-size range.
2. Choose a color range appropriate to the setting.
3. Choose a clarity range, then inspect the actual inclusions.
4. Reject stones with weak visual performance even if the paper grades look attractive.
5. Compare at least three similar candidates side-by-side.

Educational reference: GIA diamond-quality and shape guidance. Fancy-shape appearance varies materially from stone to stone, so ratios and measurements are screening tools rather than guarantees.