1. Learn about diamonds
Sometimes, I just cant help myself but to keep on emphasizing this to anyone who desire to buy a diamond online: LEARN SOMETHING ABOUT DIAMONDS! Sorry, I dont mean to shout. But in reality, many all the people are still very ignorant about diamond.

Believe it a not, there are jewelers who are unable to differentiate a diamond cut from a diamond shape. Everyone is so hyped up about the carat weight and has totally forgotten about the other 3 characteristics of a diamond.

It will not take you many years or years to learn something about diamond. There are plenty of articles and knowledge on the 4C of a diamond. Spend some useful time in the library or internet and learn about diamonds. Who knows, you may become an expert in diamonds.

2. Prioritize the 4 characteristics
There are much more about diamonds than just the 4Cs. But at the end of the day, the 4Cs are still the major factors influencing the quality and price of a diamond.

Before you initial prioritizing the 4Cs, you got to understand what your girl actually likes about a diamond. If she like big one, go for a diamond with big carat weight but with poorer quality in terms of color, cut or clarity. If she likes the brilliance of a diamond and doesnt mind the size, choose one with excellent cut and clarity. Whichever the case is, prioritizing the 4Cs will give you a better idea of what diamonds will suit her taste as well as your budget.

3. Do a price research
With your list, do some price research at some of the online jewelry stores (Here are some of the top online jewelry stores). Based on your list, you should have a rough estimate of the market price of the diamond you are looking for. If the price is out of your budget, try going for a grade lower than your expectation and you might eventually find one that suits you well.

4. Do some background research on the jewelry stores
If you have been doing researching, you would have come across data on cubic zirconium diamonds. These synthetic diamonds are D-color graded, flawless and cut to perfection. In short, a CZ diamond is a perfect diamond. It is brilliant, flawless and yet cheap. Their prices do not increase exponentially with their quality unlike diamonds.

And there are also some natural diamonds which have undergone treatments to reduce its blemishes thus enhanced its appearance. It is still a low grade diamond and dishonest dealers might try to pass it off as a great graded diamond and sell you at a higher price.

So, before you beginning swiping your hard-earned money away, do some research about the jeweler as well. Ask your family, relatives or friend who have purchased from the dealer. Online forum is a grand place to inquire of around and there are plenty of sites that provide reviews on jewelry store online.

Give the jewelry store a call, talk to their staffs and decide for yourself if you are comfortable with the store.

5. Always ask for a money back guarantee
There are risks in very form of transactions, so do buying diamonds. Protect yourself and minimize any risks by creating sure that the store has the complete details about their return policy. It should include information about the validity period, what to do if you wish to return your purchase and their address.

As a rule of thumb, online stores should offer you no less than 21 days return policy. In fact, most of them have a return policy of 30 days.

6. Choose jewelers who provide grading reports
Certified diamonds will come along with a grading report by reputable gemology organizations such as GIA or AGS. Some online jewelry stores certified their diamond by in-house gemologists and they might be using different grading standards from GIA or AGS, while others can not provide the grading reports. Diamonds from top online jewelry stores generally comes accompanied with a grading report.

After you have purchased your diamond, you should acquire it appraised again with the grading report by a trained gemologist. The grading report will be very helpful in ascertaining whether the diamond you have bought is up to the specifications shown on the report.