unit
of measure
conversions
equivalences
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italiano
 |
english
 |
|
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shape
and carat
|
SHAPE
In
addition to the traditional Round Brilliant shape, the most
common Fancy Shapes are: Oval, Pear, Marquise, Princess,
Radiant, Emerald and Heart. Less common shapes include Trillion
(or Triangular), Flanders, Asscher, Lily, Flanders Brilliant,
Asscher, Cushion, Half Moon, Trapezoids and Kite.
|
|
round
|
 |
58
facets, 33 on the crown and 25 on the pavilion. |
|
oval
|
 |
58
facet brilliant pattern, but can have a varying number of
pavilion main facets ranging from 4, 6 or 8. |
|
pear
|
 |
58
facet brilliant pattern, but can be cut with different numbers
of pavilion mains of 8,7,6, or 4 facets. |
|
marquise
|
 |
58
facet standard brilliant (33 crown, 25 pavilion), the same
as the round brilliant. However, the pavilion can be cut with
either 4,6 or 8 pavilion main facets. |
|
princess
|
 |
50
facets (21 crown, 4 girdle, 25 pavilion) or 58 facets (21
crown, 4 girdle, 33 pavilion), depending on how the pavilion
is cut. |
|
emerald
|
 |
58
facets (25 crown, 8 girdle and 25 pavilion). |
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heart
|
 |
is
a brilliant cut, which can be modified so that the number
of pavilion mains may be 6,7, or 8. |
|
trillion
|
 |
The
cut is an adaptation of the radiant cut but it is in a triangular
shape. The trillion is a triangle that has equilateral sides
and is a combination cut of the step cut and the brilliant
cut diamond. |
|
CARAT
Carat is the measuring unit of diamond weight.
The definition of a carat has changed over time, but since
1913 the international standard has been 200 milligrams,
or 1/5 of a gram (1/142 of an ounce). One carat is divided
into 100 parts, called “points.” So, a 25-point
diamond weighs a quarter carat and a 50-point diamond weighs
a half carat. A diamond may be referred to as a 3/4-carat
or 75-point stone. Jewelers usually express diamond weights
in carats and decimals. A 1.09-carat stone, for example,
is said to weigh “one oh nine carats” while a
0.99-carat diamond weighs “ninety-nine points.”
“Carat total weight” (Ct. T.W.) describes the
combined total weight of all the stones in a piece of jewelry
having more than one diamond.
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Carats
|
0.75
|
0.80
|
0.85
|
0.95
|
1.00
|
1.25
|
1.50
|
1.75
|
1.90
|
2.00
|
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mm
|
5.8
|
6.0
|
6.2
|
6.4
|
6.5
|
7.0
|
7.4
|
7.8
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8.0
|
8.2
|
Two terms,
carat and karat are often confused. In the US, karat refers to
the fineness of gold alloys
(pure gold is 24 karat; 14 karat is 14 parts gold and 10 parts
other metals) and carat refers to gem weights.
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|
Round |
Ct.
T.W. |
0.50 |
0.75 |
1.00 |
1.25 |
1.50 |
2.00 |
2.50 |
3.00 |
| mm
|
5.0 |
6.0 |
6.5 |
7.0 |
7.5 |
8.0 |
9.0 |
9.5 |
|
|
Marquise |
Ct.
T.W. |
0.50 |
0.75 |
1.00 |
1.25 |
1.50 |
2.00 |
2.50 |
3.00 |
| mm
|
7
x 4 |
8
x 4 |
10
x 5 |
10.5
x 5.5 |
11
x 5.5 |
12
x 6 |
13
x 6.5 |
14
x 7 |
|
|
Pear |
Ct.
T.W. |
0.50 |
0.75 |
1.00 |
1.25 |
1.50 |
2.00 |
2.50 |
3.00 |
| mm
|
7
x 4 |
8
x 5 |
9
x 5 |
9.5
x 5.5 |
10
x 6 |
11
x 6.5 |
12
x 7 |
13
x 8 |
|
|
Oval |
Ct.
T.W. |
0.50 |
0.75 |
1.00 |
1.25 |
1.50 |
2.00 |
2.50 |
3.00 |
| mm
|
6
x 4 |
6.5
x 5 |
7.5
x 5.5 |
8
x 6 |
8.5
x 6.5 |
9
x 7 |
9
x 7.5 |
10
x 8 |
|
|
Emerald |
Ct.
T.W. |
0.50 |
0.75 |
1.00 |
1.25 |
1.50 |
2.00 |
2.50 |
3.00 |
| mm
|
6
x 4 |
7
x 4.5 |
7
x 5 |
8
x 5 |
8.5
x 5.5 |
9
x 5.5 |
9.5
x 6 |
10.5
x 6 |
|
|
Round |
Ct.
T.W. |
0.01 |
0.015 |
0.04 |
0.055 |
0.11 |
0.18 |
0.25 |
0.35 |
| mm
|
1.3 |
1.5 |
2.0 |
2.5 |
3.0 |
3.5 |
4.0 |
4.5 |
|
|
Baguette |
Ct.
T.W. |
.035 |
0.05 |
0.06 |
0.075 |
0.11 |
0.15 |
0.20 |
0.25 |
| mm
|
2.0 |
2.5 |
3.0 |
3.5 |
4.0 |
4.5 |
5.0 |
5.5 |
|
| Trillion |
Ct.
T.W. |
0.10 |
0.12 |
0.15 |
0.25 |
0.30 |
0.40 |
0.50 |
1.0 |
| mm
|
3.0 |
3.5 |
4.0 |
4.5 |
5.0 |
5.5 |
7.0 |
9.0 |
|
| Princess |
Ct.
T.W.
| 0.05 |
0.10 |
0.15 |
0.25 |
0.30 |
0.45 |
0.60 |
1.00 |
| mm
|
2.0 |
2.5 |
3.0 |
3.3 |
3.5 |
4.0 |
5.0 |
6.0 |
note:
the weights and sizes shown are approximate!
|
shape & carat | clarity
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