This step is probably the most critical of the whole process, because believe it or not, there are a lot of different ring cuts and most (all) women have a preference. So is your girl

into the princess cut, or maybe she's after a more traditional cushion cut.

Chances are she's thrown you a hint, or you two (should have) discussed this

in the earlier stages to help narrow it down. Another option is to get assistance from your jeweler. Steven Grauer, chairman of Ritani, said, "I generally ask a few questions

about his girlfriend's personality and style, such as what kind of clothes she wears. Does she prefer the city or the wilderness? Simple or ornate designs? Generally, guys will have an idea

of what they think she might like."

Now that you've narrowed down the style of ring you're after, figure out what size you need to get. This may be a tad trickier, but we've had a few

jewelers reveal what crazy oddities they've had male customers do to determine their partner's ring size. Jeweler Nina Swistel said, "The best thing to do is to 'borrow;

another ring of hers for a day and either bring it to us or get it checked at any jewelry store."

Or some suggest pressing it into a bar of soap to

get an imprint of the size -- just be sure to carefully rinse it off afterwards. Also, make sure it's a ring she wears on her ring finger not just any ring. This is

important.

Others have suggested asking friends or family, they're bound to know (or can ask in a more subtle, less obvious way).  

This may be an easily overlooked step, but definitely a crucial one. In fact, sometimes the less obvious choices (i.e. smaller jewelers) are the way to go (i.e. more affordable) than

a name brand place. To be honest, not all men go to Jared.

"I tend to recommend local, artisan jewelers that do custom work, because of the great customer experience." Swistel

said. "They often work one-on-one with the customer, helping them design their piece, even if they know nothing about jewelry and gems."

Now that you have the type of cut and size you're after, and where you'll be getting it from, it's time to pick the rock. When shopping it's important to

keep in mind the "four C's" which consist of cut, color, clarity and carat.

Grauer explained: "The four C's of diamond quality are the universal system of quality

of any diamond, worldwide. We also suggest that customers purchase GIA-certified diamonds, the GIA is the industry leader in diamond certification."

"As for the most important aspects of the four

C's, we always start with color and clarity, as these are the first aspect of the diamond that you see," he added.

The carat size of course will be determined by

how much you're looking to spend -- the bigger the diamond the bigger the price tag.

Grader said, "An average engagement ring purchase in New York city would be $6,000 and

$9,500."

Lastly, remember this is an investment and an enormous purchase that shouldn't be skimped out on. General rule of thumb is the man should spend three months salary on

the ring.

But more contemporary ways of thinking (or for those that don't make as much) suggest compromising with two months' salary.

All in all, engagement ring shopping isn't something

to be taken lightly, and it is something you two (hopefully) should have at least discussed once prior to buying.

Jewelry designer and owner Sandy Rubin said, "This is a

gift from you, it can be whatever you want it to be. Different things work for different couples; and it's pretty great when the ring reflects that sentiment."