Are these real sapphires?

They are lab-created white sapphires, which have the same chemical composition as mined sapphire but are grown in a lab. They are genuine sapphire, not glass or cubic zirconia.

Will the white gold turn my ears green?

The setting is solid 10K white gold, so it should not turn skin green the way plated costume jewelry can. 10K white gold is usually rhodium-finished; that plating can wear over years and be re-polished by a jeweler.

About 10 mm long and 4.5 mm wide, with a 9 mm pear stone. That is a modest stud, closer to a small everyday pair than a statement earring.

Are they a good September birthstone gift?

White sapphire is a sapphire, and sapphire is the September birthstone, so they work as a September gift. The pear shape and white color also make them wearable year-round.

Can I wear them every day, including to sleep?

They are built for everyday wear, but friction backs can work loose and the 10K gold is soft. Taking them off before bed and swimming keeps the posts and backs tight longer.

How do they compare with diamond studs?

They cost far less and are durable, but white sapphire has less brilliance and fire than diamond. If sparkle matters most, diamond or moissanite will look brighter; if budget and a birthstone look matter, these are the practical pick.