0.9 carat, 1 carat and 1.1 carat - Is it true that buying diamond of unrounded weight is most economical?

Does it make any difference what carat diamond I have on my engagement ring?

My girlfriend has been dropping hints lately that she wants to get married. She's even picked out an engagement ring. I want to propose, but she's kind of ruined the surprise. Should I get her the engagement ring she picked out and forego surprises?

How much should I spend on an engagement ring?

What is the most popular shape of diamond set in an engagement ring?

What does a "cloud" mean when you're talking about diamonds?

Is it cheaper to buy a loose diamond and a ring and get it assembled than to buy a fixed diamond ring (assuming that both diamonds are of the same quality)?

I-1 Clarity Grade Diamond - To buy or not to buy?

My budget for a diamond engagement ring is not that high. I wonder which of the following is a better solution: getting a smaller sized diamond in pave setting, with diamonds going halfway around the band, or investing the same amount of money in a

What is table percentage? And what should the table percentage be for a princess or cushion cut diamond?