I purchased these earrings for an early xmas present and was delighted when they arrived.  Stones are bright and sparkly.  They look like more than 1/4 ct of diamonds.  Love the hinged design of the earrings.

Hoops are about 0.8 inch diameter so are appropriate for teens/younger girls as well as adults and the price was spectacular:  $160 delivered!  I think they are on par with these earrings:
14k Two-Tone Diamond Hoops (1/8 cttw, H-I Color, I2 Clarity), which are approximately the same size and also from the Amazon collection.  The earrings cited are almost half the price (yes, I bought both).  The big advantage of these earrings over the others is the hinge mechanism which means the hoop is 'solid' and the post fits into the solid back of the earring.  on the other pair cited, only the post hinges and it secures into a wire  catch on the back side of the loop.  This design may be more prone to wear and loss if the post becomes unattached at an inopportune time.  I'll let you know after 6 months of wear.

Both of these earrings are dainty and appropriate for formal or casual wear.  I only wear gold earrings because of a metal allergy, so to find diamond earrings at this price was spectacular.  Would love to see these in a yellow gold style but the white gold actually makes the diamonds look a more substantial size than they are.