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Heart|Natural|GIA

1.51ct G SI1 Heart Natural Diamond

EX • G/SI1 • GIA 7548658345

Certificate GIA 7548658345

Diamond specifications and retailer prices

From £3,385 GBP
As of November 6, 2026
Save £3,640 GBP (52%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £8,333 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 G 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 7548658345. Listed at 18 retailers as of November 6, 2026, with a 108% 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
G
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Pavilion angle40.1°
OriginNatural
Grading LabGIA
CertificateGIA 7548658345
Dimensions6.85 × 7.92 × 4.61 mm
L/W Ratio1.16
Girdle conditionFaceted
Top View
6.85 mm7.92 mm1.51 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 7548658345
Side View
Table 59.0%CrownGirdle: STK-VTKPavilion 40.1°Culet: NoneDepth 58.2%

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: £4,284 GBP|Low: £3,337 GBP|High: £7,275 GBP|Avg: £4,459 GBP|-7.0%
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
November 7, 2026
Retailer 5£3,385 GBP
Retailer 7£3,402 GBP
Retailer 14£3,609 GBP
Retailer 6£3,709 GBP
Retailer 2£3,765 GBP
Retailer 13£3,788 GBP
Retailer 9£3,800 GBP
Retailer 11£3,833 GBP
Retailer 3£3,997 GBP
Retailer 4£4,253 GBP
Retailer 1£4,284 GBP
Retailer 16£4,548 GBP
Retailer 8£4,726 GBP
Retailer 10£5,411 GBP
Retailer 12£6,516 GBP
Retailer 15£7,025 GBP

27 data points across 16 retailers

18 retailers£3,385 GBP to £7,025 GBP

A
Cheapest Retailer
-
£3,385 GBP
Retailer 2
-
£3,402 GBP
View
Price last confirmed 8 days ago
A
Retailer 3
-
£3,609 GBP
View
A
Retailer 4
-
£3,709 GBP
View
Final sale: no returns
A
Retailer 5
-
£3,765 GBP
View
A
Retailer 6
-
£3,788 GBP
View
A
Retailer 7
-
£3,800 GBP
View
A
Retailer 8
-
£3,833 GBP
View
A
Retailer 9
-
£3,997 GBP
View
B+
Retailer 10
-
£4,253 GBP
View
B+
Retailer 11
-
£4,284 GBP
View
B+
Retailer 12
-
£4,548 GBP
View
Retailer 13
-
£4,726 GBP
View
Price last confirmed 28 days ago
B+
Retailer 14
-
£4,889 GBP
View
B+
Retailer 15
-
£5,411 GBP
View
B
Retailer 16
-
£6,516 GBP
View
B
Retailer 17
-
£7,025 GBP
View
Most Expensive
NZ Jewellers
dfd524f4-d138-4721-ad10-4a247a2a057c · Sep 25
£8,333 GBP
$11,154 USD
View
Price last confirmed 42 days ago
17 more retailers have this diamond
Prices start from £3,385 GBPSave up to £3,640 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
£3,385 GBP