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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 £2,285 GBP
As of November 6, 2026
Save £2,857 GBP (56%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £6,129 GBP 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: £2,646 GBP|Low: £2,247 GBP|High: £5,360 GBP|Avg: £3,342 GBP|-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£2,285 GBP
Retailer 8£2,604 GBP
Retailer 1£2,646 GBP
Retailer 11£2,792 GBP
Retailer 3£2,794 GBP
Retailer 13£2,846 GBP
Retailer 6£2,882 GBP
Retailer 7£2,914 GBP
Retailer 5£3,038 GBP
Retailer 2£3,392 GBP
Retailer 9£3,763 GBP
Retailer 4£4,829 GBP
Retailer 10£5,142 GBP

28 data points across 13 retailers

16 retailers£2,285 GBP to £5,142 GBP

A
Cheapest Retailer
-
£2,285 GBP
A
Retailer 2
-
£2,604 GBP
View
A
Retailer 3
-
£2,646 GBP
View
A
Retailer 4
-
£2,792 GBP
View
A
Retailer 5
-
£2,794 GBP
View
A
Retailer 6
-
£2,846 GBP
View
Final sale: no returns
A
Retailer 7
-
£2,882 GBP
View
A
Retailer 8
-
£2,914 GBP
View
A
Retailer 9
-
£3,038 GBP
View
B+
Retailer 10
-
£3,392 GBP
View
Retailer 11
-
£3,449 GBP
View
Price last confirmed 29 days ago
B+
Retailer 12
-
£3,544 GBP
View
B+
Retailer 13
-
£3,763 GBP
View
B+
Retailer 14
-
£4,829 GBP
View
B
Retailer 15
-
£5,142 GBP
View
Most Expensive
NZ Jewellers
028c2f82-29df-442d-9e7a-e4c4f55a4700 · Sep 25
£6,129 GBP
$8,204 USD
View
Price last confirmed 42 days ago
15 more retailers have this diamond
Prices start from £2,285 GBPSave up to £2,857 GBP

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
£2,285 GBP