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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 €2,740 EUR
As of November 6, 2026
Save €3,425 EUR (56%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: €7,348 EUR 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: €3,172 EUR|Low: €2,694 EUR|High: €6,425 EUR|Avg: €4,006 EUR|-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€2,740 EUR
Retailer 8€3,121 EUR
Retailer 1€3,172 EUR
Retailer 11€3,347 EUR
Retailer 3€3,350 EUR
Retailer 13€3,412 EUR
Retailer 6€3,455 EUR
Retailer 7€3,493 EUR
Retailer 5€3,642 EUR
Retailer 2€4,066 EUR
Retailer 9€4,511 EUR
Retailer 4€5,790 EUR
Retailer 10€6,165 EUR

28 data points across 13 retailers

16 retailers€2,740 EUR to €6,165 EUR

A
Cheapest Retailer
-
€2,740 EUR
A
Retailer 2
-
€3,121 EUR
View
A
Retailer 3
-
€3,172 EUR
View
A
Retailer 4
-
€3,347 EUR
View
A
Retailer 5
-
€3,350 EUR
View
A
Retailer 6
-
€3,412 EUR
View
Final sale: no returns
A
Retailer 7
-
€3,455 EUR
View
A
Retailer 8
-
€3,493 EUR
View
A
Retailer 9
-
€3,642 EUR
View
B+
Retailer 10
-
€4,066 EUR
View
Retailer 11
-
€4,134 EUR
View
Price last confirmed 28 days ago
B+
Retailer 12
-
€4,248 EUR
View
B+
Retailer 13
-
€4,511 EUR
View
B+
Retailer 14
-
€5,790 EUR
View
B
Retailer 15
-
€6,165 EUR
View
Most Expensive
NZ Jewellers
028c2f82-29df-442d-9e7a-e4c4f55a4700 · Sep 25
€7,348 EUR
$8,204 USD
View
Price last confirmed 42 days ago
15 more retailers have this diamond
Prices start from €2,740 EURSave up to €3,425 EUR

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
€2,740 EUR