The Buyer’s Guide: Green Diamonds

Green diamonds are literally considered one in a million when you take into account that a mere handful of green diamonds will be released into the market each year, making them undoubtedly one of the most sought-after acquisitions of all Natural Fancy Color Diamonds. From mint and sea-foam to forest and emerald, green diamonds come in a range of shades that symbolize magnificence, affluence and panache.
Serious diamond investors will always own (or be on the hunt for) a green diamond in their collection because they are so elusive and valuable. With this rarity comes great investment potential for Natural Fancy Green Diamonds, particularly in unusual cuts with good color saturation and high color grades.
At Guildhall Diamonds Inc., we continue to experience ongoing price increases in the industry while also realizing diamond values on the rise with diamond reappraisals.

Origin: Natural Fancy Green Diamonds

Green diamonds usually come from South America and Africa in highly limited quantities.

With the exception of pink and red diamonds, Natural Fancy Color Diamonds obtained their colors billions of years ago when diamond carbon atoms came in contact with other trace elements during the formation stage deep beneath the Earth’s mantle with the combination of intense heat and pressure. Natural Fancy Green diamonds, however, are the only diamonds in the fancy color range to obtain their color after the carbon atoms already formed into diamond. You see, green diamonds obtain color once they are above ground when prolonged exposure to natural radiation occurs.

The depth of color (whether it is a fancy or vivid color grade) in a green diamond will depend on the type of radioactive source, the type of radiation emitted and the duration of time a diamond was exposed. This radiation joins the diamond initiating absorption in the yellow and red regions of the color spectrum, which ignites a green hue. Secondary colors in green diamonds can create grey, yellow or modifiers such as bluish-green or grey-green.

Ethical diamonds are of paramount concern. At Guildhall Diamonds Inc., the Natural Fancy Color Diamonds selected comply with the Kimberley Process to ensure that they are conflict-free diamonds.

Criteria for Natural Fancy Color Diamonds
In the 1940s, the Gemological Institute of America (GIA) developed “The Four Cs” to provide a universal system for comparing and grading diamonds. Today, the Four Cs — Color, Clarity, Cut and Carat Weight — are an internationally recognized and accepted method for describing and grading diamonds.

The Four Cs

When purchasing white diamonds, as opposed to Natural Fancy Color Diamonds, particular value factors such as clarity, cut or carat weight may take precedence over the color (on the D — Z scale) and may be the determining factor of the diamond’s value for an individual. With Natural Fancy Color Diamonds, one must take color as the primary consideration above all else. It is the color that determines the value of a Natural Fancy Color Diamond. Guildhall Diamonds Inc. seeks to find Green Diamonds in Fancy, Intense and Vivid color grades in tandem with high-clarity grades.

Green Diamonds must be evaluated on their distinct color category since they do not typically get as saturated as other color diamonds such as yellow or pink diamonds. In some cases, cutters may choose to leave naturals on the girdle to increase color saturation. This does not affect grading or price values in the market.

Finding the highest clarity possible will help ensure a long-term growth in value. It is particularly rare to find Flawless Green Diamonds nowadays, so clients will generally find Internally Flawless (IF) and VVSI (Very Very Slightly Included) diamonds in the collection at Guildhall Diamonds Inc.

Diamond clarity is evaluated through a jewellers’ loupe with 10x magnification. Diamond graders look for external characteristics called blemishes and internal characteristics called inclusions, which will have a varying impact on a diamond’s structural integrity, light performance and beauty. There are 11 clarity grades that range from Flawless to Included.

F  Flawless
IF  Internally Flawless
VVSI/2  Very, Very Slightly Included
VSI/2  Very Slightly Included
SI/2  Slightly Included
I I/2/3  Included

Cut refers to the shape of a diamond and the way in which a diamond has been fashioned. Many diamond shapes (referred to as “cuts”) can maximize color. The finish and make of a diamond brought out by cutters and polishers will express the beauty and light within the diamond. Speak to your diamond specialist about the best cuts that will bring out the most value in your selected stone.

There is a minimum carat weight that a green diamond must meet in order to be considered valuable.

GIA Grading Reports

When investing in a Natural Fancy Color Diamond, it is essential that your diamond come with a Diamond Grading Report. At Guildhall, we use GIA (Gemological Institute of America) because it is recognized as “the world’s foremost authority in diamond grading.” We are proud GIA Alumni members. Each of our diamonds comes with a full GIA Grading Report.

Expert Advice

When purchasing a Natural Fancy Color Diamond, you want to make sure that you are speaking to professionals that not only have your best interest at heart but are also experts in their field. Guildhall Diamonds Inc. specializes in Natural Fancy Color Diamonds, are members of the Natural Color Diamond Association (NCDIA), and our in-house diamond grading expert and GIA Alumni Nicole Snitman is a Diamond Grading Graduate and Accredited Jewelry Professional.

To learn more or to speak to a Guildhall representative about a green diamond, please call 1-866-274-9570 or email

To request your free Guide to Investing in Natural Fancy Color Diamonds, click here.