Ideal Cut Diamonds - A ideal
cut diamond reflects nearly all of the light that enters the stone.
A poorly cut diamond on the other hand appears glasslike. Comparing
diamonds beside a poorly cut diamond and the differences are amazing.
In 1919, Marcel Tolkowsky empirically
calculated the ideal proportions of a round diamond as part of his
Ph.D. thesis in Mathematics. An "ideal cut," according
to Tolkowsky's calculations, a ideal diamond has the following characteristics:
Round in shape, and brilliant-cut
Depth percentage: 59%
Table percentage: 53%
Crown height percentage:
Pavilion depth percentage:
Girdle thickness: Medium and even
all the way around the diamond
Perfectly aligned and formed facets
Very small or absent culet
It should be obvious that finding a
diamond to Tolkowsky's ideal diamond specifications is an expensive
undertaking. To complicate matters even more, recent studies
by the G.I.A. (Gemological Institute of America) have demonstrated
that a 59% table yields a more brilliant diamond (as opposed to Tolkowsky's
53% ideal diamond specification). Retail jewelers tend to confuse
the issue even more, since their version of the "ideal cut"
will likely vary from day to day, as their diamond inventory changes.
So how do you, the consumer, go about making the right decision with
regard to cut? What tradeoffs can you make that will yield an
almost ideal-cut diamond?
The term ideal cut is abused by retail
jewelers. Since retail jewelers can buy poorly cut diamonds at extreme
discounts, most of the diamonds found in retail mall jewelry stores
will have medium to poor diamond cuts. Far from ideal cut diamond.
Add to this that retail jewelers usually sell uncertified diamonds
(always demand GIA or HRD certified diamonds). A good rule of thumb
is to add at least three color grades and two clarity grades to a
uncertified diamond, and the cut one to two lower grades than the
retail jeweler claims (not even close to being a ideal cut diamond).
Canada Diamonds Inc is a wholesale
diamond broker selling Canadian, Russian, India and Belgium wholesale
diamonds worldwide. Only premium cut wholesale diamonds including
diamonds are brokered for clients.