Is an I-color diamond too yellow?

An I grade sits near the top of the near-colorless range. Face up, most people see white, but a slight warmth can show beside a D–F stone or in a white gold setting. Yellow gold settings hide it well.

Usually yes. VS2 inclusions are small and, in a well-cut round, typically sit off-center or under the crown facets where they are hard to spot without a loupe.

Does no fluorescence matter?

It means the stone stays neutral under daylight and UV. Strong fluorescence can make some diamonds look hazy; none avoids that risk entirely.

What does excellent polish and symmetry mean?

Both are GIA's top cut-related grades for finish. They mean the facet junctions are sharp and the stone is cut to reflect light evenly, which supports brightness and fire.

A loose diamond and its GIA grading report. A ring setting, band and appraisal are separate purchases.

Is 0.51 ct big enough for an engagement ring?

It is a common choice for a solitaire, especially on smaller fingers. On a size 6–7 hand it reads as a clear, presentable center stone rather than a large one.