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Diamonds The 4C's Clarity Color Cut Carat Weight Certification Engagement



Carat Weight (one of the 4C's) is simply the weight of a Diamond, be it One Carat or a Half Carat. It's all about how much the Diamond weighs.

Back in the days, Diamonds were weighed by seeds from a Carob Tree (where the word Carat comes from). These seeds were roughly the weight of one Point (1 pt) to a Diamond. Since there are 100 Points in a full Carat Diamond, there would be 100 Carob Seeds to balance it on a scale.

But, as we all know, things grown in nature are never quite perfect (just like Diamonds, just like people). Weighing Diamonds with seeds was never an exact science.

The Diamond Scale

Things were never exact until the Diamond Scale was invented in the early twentieth century. Now, getting the exact Carat Weight of a Diamond is easy and only takes a couple of seconds.

But, no matter how easy it is to find the Carat Weight, people still have a hard time understanding it.

Decimals, Fractions, Points, Carats, Math... Can't they make it anymore difficult?

It all boils down to money!

Carat Weights and Points are not that hard to comprehend when you know the little secret. Treat Carats and Points like Dollars and Pennies. Really! If you can count money, you already know Carat Weights.

One Dollar = 100 Pennies, right?

25 Pennies gives you a Quarter, or 1/4 of a Dollar.

50 Pennies would be 1/2 or 50 Cents...

But how do Carats fit in? The same way!

There are 100 Points in a One Carat Diamond (written as 1.00 Carat). So 1/2 Carat Diamond would simply be 50 Points or .50 Carat.

A 1/4 Carat Diamond would be 25 Points (.25 Carat).

3/4 Carat (.75 Carat) would be 75 Points. Are you following this? It really is that easy.

A 10 Point Diamond is 1/10 of a Carat or 10 Points.

A 1.50 Carat Diamond is One Carat and a Half, or a Carat and 50 Points (150 Points in all).

So then when you see a .38 Carat Diamond, you'll know it's a little more than 1/3 Carat (.33 CT) and a little less than a Half Carat (.50 CT).

58 Points is in between 1/2 and 3/4 (.50 CT & .75 CT).

So when a Jeweler tells you that the center Diamond of an Engagement Ring is 89 Points (.89 Carat), you'll know that it's just 11 Points shy of being One Full Carat (1.00 Carat).

Take a look at the image below to see all the different sizes of Carat Weights!

Diamond Carat Weight

Carat Weight Millimeter Sizes

The standard Millimeter (mm) sizes of Diamond Carat Weights are as follows:

3mm 4.1mm 5.2mm 5.9mm 6.5mm 7mm 7.4mm 7.8mm 8.2mm
Diamond .20 .25 .50 .75 1.00 1.25 1.50 1.75 2.00

Points - Carats - Fractions

Take a look at the chart below to see what the Points are, Carats are and Fractions are of your Diamond. Plus, see what that Carat Weight is often referred to as.

Points (Pt) Carats (Ct) Fractions Referred as
1 Pt .01 Ct 1/100 One Point
2 Pt .02 Ct 2/100 Two Points
3 Pt .03 Ct 3/100 Three Points
4 Pt .04 Ct 4/100 Four Points
5 Pt .05 Ct 5/100 Five Points
6 Pt .06 Ct 6/100 Six Points
7 Pt .07 Ct 7/100 Seven Points
8 Pt .08 Ct 8/100 Eight Points
9 Pt .09 Ct 9/100 Nine Points
10 Pt .10 Ct 10/100 Tenth (1/10) of a Carat
11 Pt .11 Ct 11/100 Eleven Points
12 Pt .12 Ct 12/100 Twelve Points
13 Pt .13 Ct 13/100 Thirteen Points
14 Pt .14 Ct 14/100 Fourteen Points
15 Pt .15 Ct 15/100 Fifteen Points
16 Pt .16 Ct 16/100 Sixteen Points
17 Pt .17 Ct 17/100 Seventeen Points
18 Pt .18 Ct 18/100 Eighteen Points
19 Pt .19 Ct 19/100 Nineteen Points
20 Pt .20 Ct 20/100 Fifth (1/5) of a Carat
21 Pt .21 Ct 21/100 Twenty One Points
22 Pt .22 Ct 22/100 Twenty Two Points
23 Pt .23 Ct 23/100 Twenty Three Points
24 Pt .24 Ct 24/100 Twenty Four Points
25 Pt .25 Ct 25/100 Quarter (1/4) Carat
26 Pt .26 Ct 26/100 Twenty Six Points
27 Pt .27 Ct 27/100 Twenty Seven Points
28 Pt .28 Ct 28/100 Twenty Eight Points
29 Pt .29 Ct 29/100 Twenty Nine Points
30 Pt .30 Ct 30/100 Thirty Points
31 Pt .31 Ct 31/100 Thirty One Points
32 Pt .32 Ct 32/100 Thirty Two Points
33 Pt .33 Ct 33/100 Third (1/3) of a Carat
34 Pt .34 Ct 34/100 Thirty Four Points
35 Pt .35 Ct 35/100 Thirty Five Points
36 Pt .36 Ct 36/100 Thirty Six Points
37 Pt .37 Ct 37/100 Thirty Seven Points
38 Pt .38 Ct 38/100 Three-Eights (3/8) of a Carat
39 Pt .39 Ct 39/100 Thirty Nine Points
40 Pt .40 Ct 40/100 Forty Points
41 Pt .41 Ct 41/100 Forty One Points
42 Pt .42 Ct 42/100 Forty Two Points
43 Pt .43 Ct 43/100 Forty Three Points
44 Pt .44 Ct 44/100 Forty Four Points
45 Pt .45 Ct 45/100 Forty Five Points
46 Pt .46 Ct 46/100 Forty Six Points
47 Pt .47 Ct 47/100 Forty Seven Points
48 Pt .48 Ct 48/100 Forty Eight Points
49 Pt .49 Ct 49/100 Forty Nine Points
50 Pt .50 Ct 50/100 Half (1/2) a Carat
51 Pt .51 Ct 51/100 Fifty One Points
52 Pt .52 Ct 52/100 Fifty Two Points
53 Pt .53 Ct 53/100 Fifty Three Points
54 Pt .54 Ct 54/100 Fifty Four Points
55 Pt .55 Ct 55/100 Fifty Five Points
56 Pt .56 Ct 56/100 Fifty Six Points
57 Pt .57 Ct 57/100 Fifty Seven Points
58 Pt .58 Ct 58/100 Five-Eights (5/8) of a Carat
59 Pt .59 Ct 59/100 Fifty Nine Points
60 Pt .60 Ct 60/100 Sixty Points
61 Pt .61 Ct 61/100 Sixty One Points
62 Pt .62 Ct 62/100 Sixty Two Points
63 Pt .63 Ct 63/100 Sixty Three Points
64 Pt .64 Ct 64/100 Sixty Four Points
65 Pt .65 Ct 65/100 Sixty Five Points
66 Pt .66 Ct 66/100 Sixty Six Points
67 Pt .67 Ct 67/100 Sixty Seven Points
68 Pt .68 Ct 68/100 Sixty Eight Points
69 Pt .69 Ct 69/100 Sixty Nine Points
70 Pt .70 Ct 70/100 Seventy Points
71 Pt .71 Ct 71/100 Seventy One Points
72 Pt .72 Ct 72/100 Seventy Two Points
73 Pt .73 Ct 73/100 Seventy Three Points
74 Pt .74 Ct 74/100 Seventy Four Points
75 Pt .75 Ct 75/100 Three-Quarter (3/4) Carat
76 Pt .76 Ct 76/100 Seventy Six Points
77 Pt .77 Ct 77/100 Seventy Seven Points
78 Pt .78 Ct 78/100 Seventy Eight Points
79 Pt .79 Ct 79/100 Seventy Nine Points
80 Pt .80 Ct 80/100 Eighty Points
81 Pt .81 Ct 81/100 Eighty One Points
82 Pt .82 Ct 82/100 Eighty Two Points
83 Pt .83 Ct 83/100 Eighty Three Points
84 Pt .84 Ct 84/100 Eighty Four Points
85 Pt .85 Ct 85/100 Eighty Five Points
86 Pt .86 Ct 86/100 Eighty Six Points
87 Pt .87 Ct 87/100 Eighty Seven Points
88 Pt .88 Ct 88/100 Eighty Eight Points
89 Pt .89 Ct 89/100 Eighty Nine Points
90 Pt .90 Ct 90/100 Ninety Points
91 Pt .91 Ct 91/100 Ninety One Points
92 Pt .92 Ct 92/100 Ninety Two Points
93 Pt .93 Ct 93/100 Ninety Three Points
94 Pt .94 Ct 94/100 Ninety Four Points
95 Pt .95 Ct 95/100 Ninety Five Points
96 Pt .96 Ct 96/100 Ninety Six Points
97 Pt .97 Ct 97/100 Ninety Seven Points
98 Pt .98 Ct 98/100 Ninety Eight Points
99 Pt .99 Ct 99/100 Ninety Nine Points
100 Pt 1.00 Ct 100/100 One Carat
125 Pt 1.25 Ct 125/100 One & 1/4 Carat
150 Pt 1.50 Ct 150/100 One & 1/2 Carat
175 Pt 1.75 Ct 175/100 One & 3/4 Carat
200 Pt 2.00 Ct 200/100 Two Carats

The Dream Carat Weight

If you've been looking at Diamonds, especially Diamond Engagement Rings, you'll know that a One Carat Diamond is the Dream Diamond. That's the size that every woman wants (or at least 99.9% of them).

One Carat Diamonds are the cream of the crop. The show stopper! It's the perfect size for any Diamond Ring and the perfect size for any finger.

But sadly, One Carat Diamonds are large and quite expensive. That's why the average size for a Diamond Engagement Ring is only 38 pts. So don't fret it, average works out to be pretty affordable to all! :)

Carat Weight and Carat Weight Total

One thing to note here about Carat Weights is that there are different types of Carat Weights that shouldn't be confused.

If you're looking at a Diamond Solitaire (Single Diamond), then the Carat Weight is simple; it's the Weight of that single Diamond.

But, if you're looking at a Diamond Wedding Set, then things can change dramatically. You'll have the Carat Weight of the center Diamond AND the Carat Weight of the side stones.

A lot of times Jewelers will refer to the Carat Weight of the entire ring when you are asking what the Carat Weight is. They'll say something like "The Carat Weight of this ring is 1.25 Carats". This may sound really good, but when you compare Diamond Rings elsewhere of 1.25 Carats you'll see that the price is WAY different... All for a very good reason...

The Jeweler was giving you the Total Carat Weight of the ENTIRE ring (or Carat Total Weight written as ctw), and not the breakdown of the Center Diamond Carat Weight and the side stone Carat Weight. This makes a HUGE difference.

The center Diamond could only be .33 Carat and the other .92 Carat could be in the little side Diamonds. Not good! Especially if the ring down the street had a much larger Carat Weight in the center.

The point is, if they give you a Carat Weight of the ring, make sure you find out if that's the Carat Weight of the center Diamond or the Carat Weight of the entire ring. Knowing this info can help you compare rings and prices elsewhere. Otherwise you could really be taken!

The Same Carat Weights can look different!

Two One Carat Diamonds put side by side can also look totally different in size as well. It's like two people standing side by side could be the same weight, but one could be tall and skinny, the other short and fat. Diamonds are no different. From the top view, one could look 25% smaller than the other Diamond, if not more. It all depends on how the Diamond is Cut (which all depends on how much profit they can make from the initial parent rock).

In Carat Weights, you have to look at everything to understand what's really going on. Things like mm sizes, Ideal Proportions and Girdle Thickness all come into play (which we will all get into in later posts).

Everything is affected by Carat Weight, even the Inclusions in the stone (or more appropriately, the Clarity of the Diamond). Carat Weight affects how strictly Diamonds are graded as well. Bigger Diamonds get graded more thoroughly.

Larger Carat Weights make it easier to spot Flaws and Imperfections, plus larger Carat Weights also show off the Color of the Diamond better.

All good things to consider when looking at Carat Weights...

We will get to all this, but for now, it's time for the next C of the 4C's:

The 4C'sDiamond CutDiamond ColorDiamond ClarityDiamond Carat Weight

Enjoy! :)

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