Know-your series: diamonds

August 20, 2017

Know-Your Series: Diamonds

The quality of a diamond is assessed using a universal grading system that was developed by the Gemological Institute of America (GIA), also known as the 4 C’s – color, clarity, cut and carat. We’ve created a overview with everything you need to know on each of these grades:


When examining a diamond’s color, you actually want to look for a lack of it, as there are stones that do carry a slight brown or yellow tint. The color grading scale ranges from heavily tinted (Z) to colorless (D). Here at EDV, we work with nearly colorless stones (G), an exceptional category where traces of color are very difficult to detect.


Diamonds are formed by exposing carbon to immense heat and pressure, a natural process that understandably gives rise to imperfections found in the stones. Typically, a diamond’s clarity is evaluated by the its external characteristics (blemishes), and internal characteristics (inclusions). The “heavily included” (I) category sits at one end of the grading scale, where inclusions are visible to the visible eye, while “flawless” (F) lies at the opposite end of the spectrum. Diamonds with this grade are considered extremely rare (less than 1% of diamonds fit into this category).

Our stones are graded as “slightly included” (SI), meaning they bear slight imperfections, but aren’t visible to the naked eye. Diamonds within this category can still have a brilliant appearance, while staying at a price that doesn’t break the bank.


Cut evaluates the diamond’s proportions, including its depth, symmetry and arrangement of facets, which all impact how a diamond interacts with light. Light is likely to leak through the bottom of a shallow stone, and escape through the sides if the diamond is too deep.


Carat is the most well-known characteristic among the four, and measures a diamond’s weight, not size, which it’s commonly mistaken for. While the value does indeed go up as the carat increases, it’s important to note that two diamonds of the same weight could be priced differently if you also take cut, color and clarity into consideration.


Do diamonds shine?

We love Rihanna, but we’re not sure if “shine” is the right word to describe a diamond’s natural brilliance, as by definition, that would mean they produce and emit their own light. Rather, a diamond gets its sparkle thanks to three things:  

  • reflection, or the light that bounces off from the diamond’s surface;
  • refraction, or the light that passes through and is scattered and fractured throughout the stone; and
  • dispersion, or the white light that is separated into spectral colors (creating a rainbow within the prism)

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Size Guide

Ring Sizing Using A Ring

Ring Sizing Using A String

Bracelet Sizing

Please note that ring sizes listed on this site are US / Canada sizing. Please click here for international ring size conversion.

(For example, if your ring size is 9 in Hong Kong, please choose size 5 on our site.)


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