CaratHunter
Plans
Round|Natural|GIA

1.51ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 1139615477

Certificate GIA 1139615477

Diamond specifications and retailer prices

From $22,951 NZD
$12,935 USD
As of November 1, 2026
Save $17,970 NZD (44%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $45,158 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1139615477. Listed at 21 retailers as of November 1, 2026, with a 78% 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1139615477
Dimensions7.34 × 7.32 × 4.54 mm
L/W Ratio1.00
Culet sizeNone
Top View
7.34 mm7.32 mm1.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1139615477
Side View
Table 57.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 61.9%

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: Nov 1
Current: $27,393 NZD|Low: $21,835 NZD|High: $41,415 NZD|Avg: $30,233 NZD|-0.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 6$22,951 NZD
Retailer 7$25,110 NZD
Retailer 1$27,393 NZD
Retailer 5$27,526 NZD
Retailer 8$27,949 NZD
Retailer 3$31,587 NZD
Retailer 4$38,495 NZD
Retailer 2$40,921 NZD

43 data points across 8 retailers

21 retailers$22,951 NZD to $40,921 NZD

B+
Cheapest Retailer
-
$22,951 NZD
$12,935 USD
B
Retailer 2
-
$23,965 NZD
$13,507 USD
View
B
Retailer 3
-
$24,088 NZD
$13,576 USD
View
B
Retailer 4
-
$24,536 NZD
CA$19,207 CAD
View
B
Retailer 5
-
$25,110 NZD
$14,152 USD
View
Final sale: no returns
B
Retailer 6
-
$25,701 NZD
$14,485 USD
View
B
Retailer 7
-
$26,201 NZD
$14,767 USD
View
B
Retailer 8
-
$27,393 NZD
£12,156 GBP
View
Retailer 9
-
$27,526 NZD
A$23,868 AUD
View
Price last confirmed 9 days ago
B
Retailer 10
-
$27,949 NZD
$15,752 USD
View
B
Retailer 11
-
$28,385 NZD
$15,998 USD
View
B
Retailer 12
-
$29,476 NZD
$16,613 USD
View
B
Retailer 13
-
$29,595 NZD
$16,680 USD
View
B
Retailer 14
-
$29,595 NZD
$16,680 USD
View
B
Retailer 15
-
$30,426 NZD
$17,148 USD
View
B
Retailer 16
-
$30,571 NZD
$17,230 USD
View
B
Retailer 17
-
$31,587 NZD
€16,955 EUR
View
B
Retailer 18
-
$37,120 NZD
$20,921 USD
View
B
Retailer 19
-
$38,495 NZD
ZAR 350,496 ZAR
View
B
Retailer 20
-
$40,921 NZD
£18,160 GBP
View
Most Expensive
Diamond Quarter
1.51SI1D11776546N · Oct 29
$45,158 NZD
£20,040 GBP
View
Price under review
20 more retailers have this diamond
Prices start from $22,951 NZDSave up to $17,970 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
$22,951 NZD