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Round|Natural|GIA

1.51ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 6405890761

Certificate GIA 6405890761

Diamond specifications and retailer prices

From $22,179 NZD
$12,500 USD
As of October 25, 2026
Save $17,467 NZD (44%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $46,040 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 6405890761. Listed at 22 retailers as of October 25, 2026, with a 79% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
OriginNatural
Grading LabGIA
CertificateGIA 6405890761
Dimensions7.42 × 7.39 × 4.49 mm
L/W Ratio1.00
Top View
7.42 mm7.39 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6405890761
Side View
Table 59.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 60.6%

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: $26,389 NZD|Low: $22,172 NZD|High: $42,052 NZD|Avg: $28,995 NZD|-5.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
October 30, 2026
Retailer 14$22,179 NZD
Retailer 2$23,085 NZD
Retailer 7$23,213 NZD
Retailer 16$23,633 NZD
Retailer 13$24,787 NZD
Retailer 8$25,497 NZD
Retailer 1$26,389 NZD
Retailer 12$27,133 NZD
Retailer 5$27,354 NZD
Retailer 3$28,619 NZD
Retailer 15$28,619 NZD
Retailer 4$29,308 NZD
Retailer 6$29,578 NZD
Retailer 9$30,639 NZD
Retailer 11$36,899 NZD
Retailer 10$39,646 NZD

42 data points across 16 retailers

22 retailers$22,179 NZD to $39,646 NZD

B+
Cheapest Retailer
-
$22,179 NZD
$12,500 USD
B
Retailer 2
-
$23,085 NZD
$13,011 USD
View
B
Retailer 3
-
$23,213 NZD
$13,083 USD
View
B
Retailer 4
-
$23,633 NZD
CA$18,500 CAD
View
B
Retailer 5
-
$23,818 NZD
A$20,652 AUD
View
B
Retailer 6
-
$24,787 NZD
$13,970 USD
View
B
Retailer 7
-
$25,250 NZD
$14,231 USD
View
B
Retailer 8
-
$25,497 NZD
$14,370 USD
View
Final sale: no returns
B
Retailer 9
-
$26,389 NZD
£11,711 GBP
View
B
Retailer 10
-
$26,934 NZD
$15,180 USD
View
B
Retailer 11
-
$27,133 NZD
A$23,527 AUD
View
B
Retailer 12
-
$27,354 NZD
$15,417 USD
View
B
Retailer 13
-
$28,407 NZD
$16,010 USD
View
B
Retailer 14
-
$28,619 NZD
$16,130 USD
View
B
Retailer 15
-
$28,619 NZD
$16,130 USD
View
B
Retailer 16
-
$29,308 NZD
$16,518 USD
View
B
Retailer 17
-
$29,578 NZD
$16,670 USD
View
B
Retailer 18
-
$30,639 NZD
€16,446 EUR
View
B
Retailer 19
-
$35,772 NZD
$20,161 USD
View
B
Retailer 20
-
$36,899 NZD
ZAR 335,971 ZAR
View
B
Retailer 21
-
$39,646 NZD
£17,594 GBP
View
Most Expensive
Diamond Quarter
1.51SI1E646109B5N · Oct 29
$46,040 NZD
£20,432 GBP
View
Price under review
21 more retailers have this diamond
Prices start from $22,179 NZDSave up to $17,467 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
$22,179 NZD