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3.7.2. 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% |
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.
discuss
« Pricing | Discussion »
[1] The premium/discount was calculated from a
price study of more than 50,000 diamonds for sale online.
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