length to width ratio of a oval shape
diamond is important to its value.
Popular diamond quality reports from
GIA and other gemological laboratories
do not provide length to width ratios.
However, they do provide length,
width, and depth measurements. Measurements
are always calculated to the one-hundredth
of a millimeter. The best oval diamonds
have a length-to-width ratio that
is between 1.3 to 1 and 1.7 to 1.
The length-to-width ratio is calculated
by dividing the length of the marquise
by the width. (Example) Oval length
equals 6 millimeters; oval width equals
4 millimeters; 6 millimeters divided
by 4 millimeters equals a length-to-width
ratio of 1.5 to 1.
are rarely cut to a perfect 1.5 to
1 ratio. This is a request that can
rarely, if ever, be filled. An oval
diamond's length-to-width ratio is
largely determined by the original
size of the rough diamond crystal.
When a rare, fine quality diamond
is cut by an experienced diamond cutter,
the weight and value will never be
sacrificed simply to make a diamond's
length-to-width ratio 1.5 to 1. If
the diamond is within the range of
1.3 to 1 and 1.7 to 1,extra weight
is usually not removed. GIA has established
these length-to-width ratios shown
are considered in the range of very
fine to ideal.
diamonds always look longer after
the diamond has been set in the proper
setting. Take this time to return
to our list of certified diamonds
to choose the perfect oval diamond
that is both affordable and beautifully