The Nitty Gritty-  Diamond Carat signifies the weight of the diamond.  But contrary to popular believe, it doesn’t always mean it will impact the diamond in a larger size. You must evaluate carat weight with the cut quality and measurements.  If a diamond is too bottom heavy or too shallow, it will result in a poor cut.  This can mean the diamond will appear smaller from top view. For example Look at this 1 carat diamond from James Allen with a good cut  vs this .90 carat excellent cut stone. The .90 is the same measurement as the 1 carat and its $1,000 cheaper!!!     Buying an engagement ring online can be tricky because they all look the same, However use the Length to Width Ratio to see evidence of size.  Truth is, in person its hard to tell once its thrown on a ring and covered in bling.  Read below on how to purchase the best diamond carat that represents its proper size and proportions.

Don’t be scared to drop me an email to ask for help.  I can guide you through your questions and help you locate the right stone.

Diamond Carat

Here are sample photos using James Allen’s 360 Technology.    A perfect example of  two 1.02 carat diamonds with different sizes.  Please notice the length to width ratio, cut, girdle and depth.

Diamond Carat

 Excellent cut has a L/W ratio of  6.42-6.44  versus 6.32-6.24

Please note measurements  L/W  to see evidence of size difference.

Length to width is the measurement of the diamond from side to side and top to bottom.  Girdle is the “waist of the diamond”.  Extra weight may be stored there.  The depth is how deep the diamond goes.  Each shape has an ideal depth percentage.  The cut is the grade given after all these factors play their role to determine the beauty of the stone.


Once again taken using sample photos using James Allen’s 360 Technology.  A fancy shape(diamond shape other than round) doesn’t come with an official cut grade.  You must rely on other variables. to determine but most important is the eye when it comes to fancy shapes.

Diamond Carat size

 Excellent cut has a L/W ratio of 5.63-5.62   versus  5.23-5.14

What diamond carat weight should you buy?

Diamond carat is the most important choice as it will affect the price the most. I hate to say that the safe approach is the bigger the better. Some girls love their rings small and dainty.  I call them unicorns :). But in all seriousness, some do prefer smaller diamond engagement rings.  Its important to gauge her expectations before hand.  You don’t want her to dislike her ring. There are several ways to enhance the size/look of a diamond.  Buying an engagement ring online that has a halo can add to the weight to give a nice large look.

If she hasn’t been vocal about what rings she likes, chat with her best friend or even mother. You can always take a peek of her pint rest if she has, you may just find some images there. Please find my Carat weight article for deeper understanding.


Below is a video I made showing different diamond carat sizes next to each other.

Recommended Places To Buy

For me to recommend any business, they must meet certain criteria. They must prove valuable to my clients in regards to How to buy a diamond savings and selection | EXPECT 20%-40% LOWER PRICES THAN TRADITIONAL JEWELERS |, time doing business(legitimacy), reputation, and return policy.

James Allen Logo

James Allen  is my favorite vendor.  They revolutionized the ability to get the clearest image of a Diamond with a 360 degree HD image/video and a zoom in up to 40x on all their Diamonds. This without question leaves no doubt on what you are buying.  I argue the ability to see your diamond more clearly than in a physical retail store is a massive plus for you.  They have incredible prices that I will easily  beat retail store pricing.  They have an a amazing 30 day Free no hassle return policy and have been in business for over ten years with countless positive reviews from real customers. The only Con is they are slightly limited in the search filtering ability. Blue Nile  has a deeper way of filtering certain attributes.  Click on this link or Picture to search their inventory.


Blue nile logo

Blue Nile was the original online giant that opened in 1999! They probably have the largest selection. In the past they didn’t have images of their inventory but because of James Allen , they were forced to adapt and they now have a large amount of their inventory with images.  There viewing technology is not as good as James Allen  but its still clear and one can evaluate a Diamond with confidence.  Blue Nile  has an incredible 30 day free return policy as well that is insured.  The only Con is they do not have AGS certified goods on their site.  This isn’t an issue for round diamonds but very helpful with fancy shapes like Princess, Cushion, Oval etc… Click on this link or the Blue Nile Logo to see their inventory.


buying a diamond over 1 carat

Brian Gavin opened in 2009. He is a 5th generation Master Diamond Cutter. He is an authority when it comes to crafting Hearts & Arrows Diamonds and is well respected in the industry.  The company sells reasonably priced diamonds.   An excellent brilliant Cut grade is the focus of Brain Gavin and its his biggest PRO.  Many stones are AGS Certified with excellent cuts and this is helpful with fancy cut diamonds(Princess, Cushion,Emerald, etc).  A negative  is a 15 day return policy. Most will prefer more time however its still a respectable amount of time.  A client should know quickly  if  pleased with a purchase. There are also some exceptions to certain custom work. Feel free to dig deeper in the about section of his site as it may not apply to your purchase.  Click of the Brian Gavin Logo or this link to see their site.

Feel free to reach out and send me a message. Do you want buying advice on How to buy a diamond or have you found a stone you wish for me to evaluate. Feel free to drop me a line and say hello. Advice is free.