Is a bezel setting good for a heart-shaped diamond?

Yes. The heart's bottom point and two upper lobes are thin and easy to chip, and a bezel surrounds the whole girdle with metal. The trade-off is that the rim hides some of the stone's outer facets.

How big is a 1.56 carat heart diamond?

A heart of that weight typically measures around 7 to 8 mm across, depending on depth and proportions. It reads as a noticeable solitaire on most hands without being oversized.

What does IGI certified mean here?

The diamond has been graded by the International Gemological Institute, which reports its carat weight, color, clarity and cut. Ask for the report number so you can check the stone's specifics.

Will it sit flush with a wedding band?

A bezel solitaire usually sits fairly low, so a straight band often fits close beside it. Curved or contoured bands are the safer choice if the head sits higher than expected.

Can a bezel-set diamond be resized or reset later?

The band can usually be resized by a jeweler, though full bezels are harder to reset than prong settings because the metal must be cut away from the stone.