Is 29mm too small for a women's watch?

It reads as a classic dress size, close to the traditional 28–30mm range. It suits slim to average wrists; on a larger wrist it will look delicate rather than substantial.

Is the bezel set with real diamonds?

Yes. The fixed bezel holds 44 Wesselton diamonds. Wesselton is a color grade for near-colorless stones, not a brand.

Does it need winding or a battery?

It is quartz, so it runs on a battery and needs no winding. A jeweler replaces the battery when it stops.

Is it water resistant?

Longines rates this line for light everyday contact only, not swimming. Take it off before showering or swimming, especially with the leather strap.

What comes in the box?

The watch in its manufacturer's packaging. The strap is fitted; no extra strap is included.

How does it compare with the Cartier Tank?

Both are slim quartz dress watches. The Longines has a round case and a diamond bezel; the Tank has a rectangular case and a more recognizable shape, usually at a higher price.