Is the gold solid or plated?

It is 18K red gold, which is 75% gold alloyed with copper to give the rose tone. That is solid gold, not a plating over base metal.

How much diamond is in the cross?

The diamonds are described as accents on the cross, but no total carat weight or clarity grade is given. Ask the seller for the diamond specs before buying if sparkle matters to you.

What is red gold compared with rose gold?

They are essentially the same idea: gold alloyed with copper for a warm pink tone. Red gold usually has a slightly deeper, redder cast than typical rose gold.

Does it come with a chain?

The listing describes the cross pendant itself. Confirm with the seller whether a chain is included and what length and metal it is.

Can it be worn every day?

It can, but fine diamond settings and a delicate pendant are better suited to occasional wear. Take it off for gym, swimming and showering to protect the stones and finish.