Ross Simons used to be a very reliable company, but I feel they have gone downhill. They used to be strictly gold, platinum, or silver and now they sell vermeil and resin filled items. And lots of cz. You have to be very careful with their descriptions.
That said, the items I purchased in the past were very well-made.
The following is what it says about the specs of your diamonds, no mention of cut which would make me a little leary.
(Quantity: 10, Shape: Round, Color Grade: I-J, Clarity: I1-I2, Weight: 0.50 ct. t.w.)