Reputable places to buy 1 ct diamond studs

Such informative information here thank you ALL.

Buying a diamond excellent cut:
What about Fluorescence rating for H color vs. I color etc?

Size 1 carat total weight ..
 
I would recommend finding an independent local jeweler that you can trust. This way you can see things in person. And, sometimes, the stones you fall in love with are not the highest spec on paper.