Is this chain solid gold or plated?

It is solid 10K yellow gold throughout, not gold-plated or gold-filled. The 10K stamp means it is 41.7% pure gold alloyed with other metals for strength.

How does 10K gold compare with 14K?

10K is harder and more scratch-resistant but has a slightly paler yellow tone and lower resale value. 14K looks richer and is softer, so it dents and scratches more easily.

Will a 20-inch chain fit me?

A 20-inch chain typically sits at the collarbone or just below on most adults. This one is not sizable, so check your neck measurement before buying, since links cannot be added or removed.

What is a box clasp and is it secure?

A box clasp slides a tab into a box and snaps shut, giving a clean look with no dangling hook. It is secure for daily wear but should be checked periodically, as the tab can bend loose over time.

Can I wear it every day, including in the shower?

10K gold tolerates water and sweat better than higher karats, but soap, chlorine and lotions dull the finish over time. Rinse and dry it after swimming or showering to keep the shine.

Does it come with a certificate of authenticity?

The listing notes a Globalwatches10 certification, which is a third-party authentication document rather than a grading report. It confirms the metal content, not a diamond or gemstone grade, since there is no stone.