How to Buy Diamonds

The Four Cs


The cut actually pertains to both the shape of the diamond and the make (how well a diamond is cut to good proportions and polish). Shapes include round, marquise, princess, radiant, pear, oval, emerald, and heart, and a few rare shapes. The Make includes details such as table percentage, depth percentage, polish, and symmetry etc.


The color of diamonds varies from colorless (highest quality) to many shades of yellow (less rare).


Diamonds are a natural substance, and no two diamonds are exactly alike. A diamond with more inclusions will be less rare, so it will be less expensive. But this does not necessarily mean it will be less beautiful to the naked eye.

Carat Weight

The weight of diamonds is measured in carats. Larger diamonds are much more rare, so a 2-carat stone will be worth significantly more than 2 diamonds of the same quality weighing 1 carat each.

Return to top of page

Ideal cut diamonds

So what is Ideal Cut?

Everyone has their own opinion on what Ideal is. Some people prefer a diamond to have a somewhat larger table, say around 60%, so the diamond "looks" bigger. Some want the Tolkowsky Ideal Cut, as calculated in the early 20th century by mathematician Markov Tolkowsky. The diagram below describes the Class 1 and 2 grades of GIA. They are the largest body in the world for diamond grading, and we use their classifications to grade our diamonds. Class 1 is Ideal. Class 2 is Very Fine, Class 3 is Fair, and Class 4 is Poor. GIA's definition of "Ideal - Very Fine" Class are as follows:

Ideal to Fine Cut

Please keep in mind that diamonds other than Round Brilliant do not always have their cuts measured in such detail because they are classified as "fancy shape" diamonds and have very loose tolerances.

When buying a diamond, especially a Round Brilliant cut diamond, it is always best to have a complete analysis of the cut. This will tell you all the specifications of the diamond's cut such as table percentage, depth percentage, etc., usually obtained from a scope (or megascope). Ask your jeweler for this report on the cut when making a diamond purchase.


Diamond Cut

Conflict Diamonds

Conflict diamonds are diamonds that originate from areas controlled by forces or factions opposed to legitimate and internationally recognized governments. They are used to fund military action in opposition to those governments, or in contravention of the decisions of the United Nations Security Council. In May 2000, an initiative was launched in Kimberley, South Africa that aims to break the link between the legitimate trade in diamonds and conflict diamonds. It is called the Kimberley process. We recommend that consumers ask their jeweller whether they adhere to the Kimberley process and the official certification methods associated with it. Conflict diamonds compromise international peace and human security and hamper economic and social development in affected countries. The best way to promote a world free of conflict diamonds is to ensure that every retailer is 100% fully compliant with the Kimberley process.

All diamonds at PERTH DIAMOND EXCHANGE have been purchased from legitimate sources not involved in funding conflict and in compliance with United Nations resolution. We hereby guarantee that our diamonds are conflict free, based on personal knowledge and/or written guarantees provided by the supplier of our diamonds.

Return to top of page

Buy a diamond online

Search our extensive online database and find the perfect diamond that fits your budget.

Step 1: Log into the diamond inventory search.

Step 2: Search our international database of over 10000 diamonds.

Step 3: If you are confused or need assistance with the diamond search please call us for professional advice.

Step 4: Choose your diamond(s) and make payment. Click here to open the Credit Card Authorisation Form (requires Adobe Reader).

Step 5: Your diamond will be sent via Fedex once payment has cleared which is usually 2-3 day shipping.

Step 6: We offer a 14 day full refund service if you are not satisfied with the stone this is only valid on site unseen purchases.

Need help? Contact Us for assistance when choosing your diamond, or to enquire about designing jewellery to set your diamond in.

Return to top of page

Advantages to shopping online for diamonds

  1. Prices are much less. Diamond dealers online simply don't have anywhere near the overhead stores do. These costs include renting commercial space, staff, security, displays, decor, and especially inventory. These expenses are well factored into the price of your diamonds when buying in a store.
  2. Selection is much better. Stores stock a small amount of loose diamonds; they simply don't have the sheer traffic and volume online merchants enjoy. This results in less inventory expenses factored into your jewelry and a much wider selection.
  3. Convenience. Many online merchants have a database of loose diamonds you can browse and search through, making comparisons simple and painless. Shopping from store to store can be very tedious and time consuming.

Return to top of page

Buy a diamond with our assistance

Contact us and receive professional assistance from a trained specialist when choosing your diamond.

Step 1: Read information about Diamond Shapes and decide on a budget, diamond shape and grade that you would like.

Step 2: If you would like your diamond to be set we have hundreds of the best designs in house that you can have without waiting.

Step 3: Contact us at least a few days before you intend to purchase a diamond so we can give you the latest update on stock availability.

Step 4: When you visit the boutique we can finalize your design and have the diamond set you may also like to view matching wedding bands.

Return to top of page