Is this chain solid silver or plated?

It is 925 sterling silver throughout, not a silver-plated base metal. That means it can be polished and re-finished rather than wearing through to a different color.

Which length should I choose?

20 in sits at the collarbone, 22 in rests on the chest, and 24 to 26 in hang lower over a shirt. The 22 in version weighs about 32.8 g, so longer lengths will feel heavier.

Will it fit a pendant?

The links are 4 mm wide, so thin bails slide on but thick or pronged bails may not. Check your pendant's opening before ordering.

Does sterling silver tarnish?

Yes. Sterling silver darkens over time, faster with sweat, perfume and humidity. Store it dry and polish with a silver cloth to bring back the shine.

Is a box chain strong enough for daily wear?

Box links are sturdy and resist stretching, but they are less flexible than curb chains and can kink if pulled hard. It holds up well for everyday wear if you avoid snagging it.