Types of diamond blemishes:
- Polish Line - these occur in the polishing of
the diamond - this is how the
diamond shape happens. These will only be present on one facet
and do not extend to the next.
- Abrasion - these are a group of small nicks on
the surface that can cause the edges to have a white
- Natural - this is where an edge has been left
as the original surface, e.g. the rough diamond.
- Nick - this is a small indent on a facet
- Scratch - a thin line across the diamond's
Diamond Clarity Scale
Institute of America has a diamond clarity scale. This scale is
what expert graders will use to identify the clarity of an
individual diamond. The scale for diamond clarity is split into 6
categories with 11 grades total within those.
- FL - These diamonds are flawless
- IF - Are internally flawless
- VVS1 & VVS2 - Very, very slightly
- VS1 & VS2 - Very Slightly included
- SI1 & SI2 - Slight included
- I1, I2, & I3 - Imperfect
When choosing your precious stone, you'll want to pick an
eye-clean diamond. This is a diamond that has no inclusions or
blemishes visible to the naked eye. After all, it's very unlikely
that you'll be examining the diamond clarity of your studded
a jeweler's magnifier on a frequent basis.
5 Diamond Clarity Factors
There are 5 factors that go into determining diamond clarity.
Each of these is taken into account when grading the clarity of the
stone based on its inclusions.
- Color - The color of blemishes impacts how
easily it is seen within the gem compared to the diamond color
- Size - larger inclusions or blemishes will
cause the diamond clarity to be lower.
- Position - the position of flaws is also taken
into consideration. For example, a blemish under the table has a
bigger impact on diamond clarity than ones placed elsewhere.
- Number - how many natural birthmarks the stone
has is also an essential factor in determining diamond
- Type - the type of inclusion affects not just
the diamond clarity but also the durability of the stone.
What are Diamond Clarity Plots?
When grading a D - Z colored diamond, a clarity plot is an
important part of the process. A diamond clarity plot is
essentially a map to the features of the diamond. The chart will
look like the individual stone, reflecting its facets and shape.
Each clarity plot has a top and bottom diagram of the gemstone with
the imperfections marked on each. Different colors and symbols are
used to specifically identify each type of blemish.
The 4 Cs of Diamonds
The 4 Cs contain not only diamond clarity for grading, but three
different aspects that all begin with C. These are used by jewelers
to determine the quality of each individual precious stone.