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Round|Natural|GIA

1.51ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 6405215785

Certificate GIA 6405215785

Diamond specifications and retailer prices

From $22,256 NZD
$12,500 USD
As of October 25, 2026
Save $17,528 NZD (44%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $46,201 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 6405215785. 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
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6405215785
Dimensions7.44 × 7.41 × 4.45 mm
L/W Ratio1.00
Top View
7.44 mm7.41 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6405215785
Side View
Table 61.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 59.9%

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: $26,481 NZD|Low: $22,249 NZD|High: $42,199 NZD|Avg: $28,992 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$22,256 NZD
Retailer 2$23,166 NZD
Retailer 7$23,294 NZD
Retailer 16$23,716 NZD
Retailer 13$24,874 NZD
Retailer 8$25,586 NZD
Retailer 1$26,481 NZD
Retailer 12$27,228 NZD
Retailer 5$27,450 NZD
Retailer 3$28,719 NZD
Retailer 15$28,719 NZD
Retailer 4$29,410 NZD
Retailer 6$29,681 NZD
Retailer 10$30,619 NZD
Retailer 11$37,028 NZD
Retailer 9$39,784 NZD

42 data points across 16 retailers

22 retailers$22,256 NZD to $39,784 NZD

B+
Cheapest Retailer
-
$22,256 NZD
$12,500 USD
B
Retailer 2
-
$23,166 NZD
$13,011 USD
View
B
Retailer 3
-
$23,294 NZD
$13,083 USD
View
B
Retailer 4
-
$23,716 NZD
CA$18,500 CAD
View
B
Retailer 5
-
$23,901 NZD
A$20,652 AUD
View
B
Retailer 6
-
$24,874 NZD
$13,970 USD
View
B
Retailer 7
-
$25,338 NZD
$14,231 USD
View
B
Retailer 8
-
$25,586 NZD
$14,370 USD
View
Final sale: no returns
B
Retailer 9
-
$26,481 NZD
£11,711 GBP
View
B
Retailer 10
-
$27,028 NZD
$15,180 USD
View
B
Retailer 11
-
$27,228 NZD
A$23,527 AUD
View
B
Retailer 12
-
$27,450 NZD
$15,417 USD
View
B
Retailer 13
-
$28,506 NZD
$16,010 USD
View
B
Retailer 14
-
$28,719 NZD
$16,130 USD
View
B
Retailer 15
-
$28,719 NZD
$16,130 USD
View
B
Retailer 16
-
$29,410 NZD
$16,518 USD
View
B
Retailer 17
-
$29,681 NZD
$16,670 USD
View
B
Retailer 18
-
$30,619 NZD
€16,378 EUR
View
B
Retailer 19
-
$35,897 NZD
$20,161 USD
View
B
Retailer 20
-
$37,028 NZD
ZAR 335,971 ZAR
View
B
Retailer 21
-
$39,784 NZD
£17,594 GBP
View
Most Expensive
Diamond Quarter
1.51SI1E6485F425N · Oct 29
$46,201 NZD
£20,432 GBP
View
Price under review
21 more retailers have this diamond
Prices start from $22,256 NZDSave up to $17,528 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
$22,256 NZD