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1.51ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 2427279307

Certificate GIA 2427279307

Diamond specifications and retailer prices

From $16,203 NZD
$9,100 USD
As of October 25, 2026
Save $17,556 NZD (52%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $33,758 NZD at Diamond Quarter · As of October 29, 2026
View at Diamond Quarter

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2427279307. Listed at 19 retailers as of October 25, 2026, with prices from $16,203 to $33,758, a $17,556 spread on the same certified stone. Diamond Quarter lists it at $33,758. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.51
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 2427279307
Dimensions7.41 × 7.37 × 4.53 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
7.41 mm7.37 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2427279307
Side View
Table 58.0%Crown 32°Girdle: Slightly ThickPavilion 41.4°Culet: NoneDepth 61.2%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 25
Current: $21,867 NZD|Low: $16,203 NZD|High: $28,017 NZD|Avg: $21,288 NZD|-1.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 6$16,203 NZD
Retailer 8$16,446 NZD
Retailer 9$17,538 NZD
Retailer 2$19,278 NZD
Retailer 5$19,517 NZD
Retailer 3$21,389 NZD
Retailer 1$21,867 NZD
Retailer 7$25,729 NZD
Retailer 4$27,831 NZD

42 data points across 9 retailers

19 retailers$16,203 NZD to $33,758 NZD

B+
Cheapest Retailer
-
$16,203 NZD
$9,100 USD
B+
Retailer 2
-
$16,446 NZD
$9,237 USD
View
B+
Retailer 3
-
$17,538 NZD
$9,850 USD
View
B+
Retailer 4
-
$17,727 NZD
$9,956 USD
View
B+
Retailer 5
-
$19,203 NZD
$10,785 USD
View
B+
Retailer 6
-
$19,278 NZD
£8,525 GBP
View
B+
Retailer 7
-
$19,498 NZD
$10,951 USD
View
B+
Retailer 8
-
$19,517 NZD
A$16,864 AUD
View
B+
Retailer 9
-
$20,778 NZD
$11,670 USD
View
B+
Retailer 10
-
$20,778 NZD
$11,670 USD
View
B+
Retailer 11
-
$21,389 NZD
€11,441 EUR
View
B+
Retailer 12
-
$21,867 NZD
£9,671 GBP
View
B
Retailer 13
-
$22,158 NZD
$12,445 USD
View
B
Retailer 14
-
$23,200 NZD
$13,030 USD
View
Retailer 15
-
$23,323 NZD
$13,099 USD
View
Price last confirmed 7 days ago
Retailer 16
-
$25,729 NZD
ZAR 233,452 ZAR
View
Price last confirmed 12 days ago
B
Retailer 17
-
$27,831 NZD
£12,308 GBP
View
B
Retailer 18
-
$29,544 NZD
$16,593 USD
View
Most Expensive
B
Diamond Quarter
1.51SI1E2407034AN · Oct 29
$33,758 NZD
£14,929 GBP
View
18 more retailers have this diamond
Prices start from $16,203 NZDSave up to $17,556 NZD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

B+
1.51ct Round
$16,203 NZD