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Heart|Natural|GIA

1.51ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 1242005145

Certificate GIA 1242005145

Diamond specifications and retailer prices

From $5,518 NZD
As of November 6, 2026
Save $6,898 NZD (56%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $14,799 NZD at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 1.51ct natural heart diamond

This 1.51ct natural heart sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1242005145. Listed at 16 retailers as of November 4, 2026, with a 125% 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1242005145
Dimensions7.02 × 7.91 × 4.55 mm
L/W Ratio1.13
Girdle conditionFaceted
Top View
7.02 mm7.91 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1242005145
Side View
Table 58.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 57.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $6,388 NZD|Low: $5,426 NZD|High: $12,941 NZD|Avg: $8,068 NZD|-6.8%
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
November 6, 2026
Retailer 12$5,518 NZD
Retailer 8$6,287 NZD
Retailer 1$6,388 NZD
Retailer 11$6,741 NZD
Retailer 3$6,747 NZD
Retailer 13$6,871 NZD
Retailer 6$6,959 NZD
Retailer 7$7,035 NZD
Retailer 5$7,335 NZD
Retailer 2$8,190 NZD
Retailer 9$9,086 NZD
Retailer 4$11,660 NZD
Retailer 10$12,416 NZD

28 data points across 13 retailers

16 retailers$5,518 NZD to $12,416 NZD

A
Cheapest Retailer
-
$5,518 NZD
A
Retailer 2
-
$6,287 NZD
View
A
Retailer 3
-
$6,388 NZD
View
A
Retailer 4
-
$6,741 NZD
View
A
Retailer 5
-
$6,747 NZD
View
A
Retailer 6
-
$6,871 NZD
View
Final sale: no returns
A
Retailer 7
-
$6,959 NZD
View
A
Retailer 8
-
$7,035 NZD
View
A
Retailer 9
-
$7,335 NZD
View
B+
Retailer 10
-
$8,190 NZD
View
Retailer 11
-
$8,327 NZD
View
Price last confirmed 28 days ago
B+
Retailer 12
-
$8,556 NZD
View
B+
Retailer 13
-
$9,086 NZD
View
B+
Retailer 14
-
$11,660 NZD
View
B
Retailer 15
-
$12,416 NZD
View
Most Expensive
NZ Jewellers
028c2f82-29df-442d-9e7a-e4c4f55a4700 · Sep 25
$14,799 NZD
$8,204 USD
View
Price last confirmed 42 days ago
15 more retailers have this diamond
Prices start from $5,518 NZDSave up to $6,898 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.

A
1.51ct Heart
$5,518 NZD