PriceScope

Price differences for surveyed diamonds


Table 3. Average cost of all 17 stones based on their grading and the premium or discount[1] that their certificates attract.
Stone # GIA-GTL AGSL EGL USA
Price Price Diff. to GIA Price Diff. to GIA
1 $2,576 $2,296 -11% $2,458 -5%
2 $2,922 $2,922 0% $2,758 -6%
3 $4,248 $4,426 4% $3,634 -14%
4 $4,540 $4,541 0% $3,925 -14%
5 $1,522 $1,456 -4% $1,527 0%
6 $1,496 $1,964 31% $1,478 -1%
7 $2,075 $1,915 -8% $1,707 -18%
8 $1,607 $1,501 -7% $1,569 -2%
9 $2,058 $2,219 8% $1,696 -18%
10 $2,453     $2,212 -10%
11 $2,952 $2,668 -10% $2,624 -11%
12 $2,653 $2,398 -10% $2,103 -21%
13 $2,152 $2,152 0% $2,137 -1%
14 $4,127 $5,907 43% $4,716 14%
15 $8,451 $7,264 -14% $6,739 -20%
16 $8,255 $7,708 -7% $6,323 -23%
17 $2,246 $2,047 -9% $1,892 -16%
Average $3,314 $3,337 1% $2,912 -10%
Stone #
1
GIA-GTL
Price
$2,576
AGSL
Price
$2,296
AGSL
Diff. to GIA
-11%
EGL USA
Price
$2,458
EGL USA
Diff. to GIA
-5%
2
GIA-GTL
Price
$2,922
AGSL
Price
$2,922
AGSL
Diff. to GIA
0%
EGL USA
Price
$2,758
EGL USA
Diff. to GIA
-6%
3
GIA-GTL
Price
$4,248
AGSL
Price
$4,426
AGSL
Diff. to GIA
4%
EGL USA
Price
$3,634
EGL USA
Diff. to GIA
-14%
4
GIA-GTL
Price
$4,540
AGSL
Price
$4,541
AGSL
Diff. to GIA
0%
EGL USA
Price
$3,925
EGL USA
Diff. to GIA
-14%
5
GIA-GTL
Price
$1,522
AGSL
Price
$1,456
AGSL
Diff. to GIA
-4%
EGL USA
Price
$1,527
EGL USA
Diff. to GIA
0%
6
GIA-GTL
Price
$1,496
AGSL
Price
$1,964
AGSL
Diff. to GIA
31%
EGL USA
Price
$1,478
EGL USA
Diff. to GIA
-1%
7
GIA-GTL
Price
$2,075
AGSL
Price
$1,915
AGSL
Diff. to GIA
-8%
EGL USA
Price
$1,707
EGL USA
Diff. to GIA
-18%
8
GIA-GTL
Price
$1,607
AGSL
Price
$1,501
AGSL
Diff. to GIA
-7%
EGL USA
Price
$1,569
EGL USA
Diff. to GIA
-2%
9
GIA-GTL
Price
$2,058
AGSL
Price
$2,219
AGSL
Diff. to GIA
8%
EGL USA
Price
$1,696
EGL USA
Diff. to GIA
-18%
10
GIA-GTL
Price
$2,453
AGSL
Price
 
AGSL
Diff. to GIA
 
EGL USA
Price
$2,212
EGL USA
Diff. to GIA
-10%
11
GIA-GTL
Price
$2,952
AGSL
Price
$2,668
AGSL
Diff. to GIA
-10%
EGL USA
Price
$2,624
EGL USA
Diff. to GIA
-11%
12
GIA-GTL
Price
$2,653
AGSL
Price
$2,398
AGSL
Diff. to GIA
-10%
EGL USA
Price
$2,103
EGL USA
Diff. to GIA
-21%
13
GIA-GTL
Price
$2,152
AGSL
Price
$2,152
AGSL
Diff. to GIA
0%
EGL USA
Price
$2,137
EGL USA
Diff. to GIA
-1%
14
GIA-GTL
Price
$4,127
AGSL
Price
$5,907
AGSL
Diff. to GIA
43%
EGL USA
Price
$4,716
EGL USA
Diff. to GIA
14%
15
GIA-GTL
Price
$8,451
AGSL
Price
$7,264
AGSL
Diff. to GIA
-14%
EGL USA
Price
$6,739
EGL USA
Diff. to GIA
-20%
16
GIA-GTL
Price
$8,255
AGSL
Price
$7,708
AGSL
Diff. to GIA
-7%
EGL USA
Price
$6,323
EGL USA
Diff. to GIA
-23%
17
GIA-GTL
Price
$2,246
AGSL
Price
$2,047
AGSL
Diff. to GIA
-9%
EGL USA
Price
$1,892
EGL USA
Diff. to GIA
-16%
Average
GIA-GTL
Price
$3,314
AGSL
Price
$3,337
AGSL
Diff. to GIA
1%
EGL USA
Price
$2,912
EGL USA
Diff. to GIA
-10%


Price differences compared to similar GIA-GTL graded diamonds.
Figure 3. Price differences compared to similar GIA-GTL graded diamonds. Each positive or negative difference on the chart corresponds to higher or lower prices for similar diamonds listed for sale with respective reports.
 
 
 
Figure 4. 56% of the surveyed diamonds would cost less if sold with AGS rather than GIA reports, mainly as a result of stricter clarity grading 80% of the diamonds would cost less if bought with EGL rather than GIA reports. Discounting of EGL graded diamonds was greater than any premiums as a result of softer color grading.



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[1] The premium/discount was calculated from a price study of more than 50,000 diamonds for sale online.