Is a lab grown diamond a real diamond?

Yes. It has the same carbon crystal structure and hardness as a mined diamond, just grown in a lab. It is not a simulant like cubic zirconia.

How does a heart cut compare with a round brilliant?

A heart cut is a modified brilliant with a cleft and a point, so it sparkles well but is less forgiving of poor cutting. Round brilliants hide inclusions better and are easier to match to a band.

Is 10K white gold good for an everyday ring?

Yes. 10K gold is 41.7 percent gold alloyed with harder metals, so it scratches less than 14K or 18K. White gold is rhodium plated, and that plating wears off over time and needs redoing.

Will the pointed tip of the heart chip?

The point is the most vulnerable part of a heart cut. A prong-set solitaire leaves it exposed, so it is worth insuring and avoiding hard knocks.

Can this ring be resized?

A plain 10K gold solitaire band can usually be resized by a jeweler, though a full eternity-style band could not. Have a jeweler check the setting before sizing.