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Heart|Natural|GIA

1.51ct L SI2 Heart Natural Diamond

EX • L/SI2 • GIA 6421737922

Certificate GIA 6421737922

Diamond specifications and retailer prices

From £1,278 GBP
As of November 4, 2026
Save £2,143 GBP (63%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £3,421 GBP at NZ Jewellers · As of November 5, 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 L colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6421737922. Listed at 10 retailers as of November 4, 2026, with prices from £1,278 to £3,421, a £2,143 spread on the same certified stone. NZ Jewellers lists it at £3,421. 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
L
Colour
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6421737922
Dimensions7.17 × 8.04 × 4.41 mm
L/W Ratio1.12
Top View
7.17 mm8.04 mm1.51 ctL / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6421737922
Side View
Table 56.0%CrownGirdlePavilionCulet: NoneDepth 54.8%

Caratlytics Score

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

Price History

Last verified: Nov 4
Current: £3,421 GBP|Low: £1,278 GBP|High: £3,671 GBP|Avg: £1,715 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 7£1,278 GBP
Retailer 5£1,403 GBP
Retailer 6£1,403 GBP
Retailer 2£1,416 GBP
Retailer 10£1,467 GBP
Retailer 9£1,505 GBP
Retailer 3£1,523 GBP
Retailer 8£1,618 GBP
Retailer 4£1,902 GBP
NZ Jewellers£3,421 GBP

44 data points across 10 retailers

10 retailers£1,278 GBP to £3,421 GBP

A
Cheapest Retailer
-
£1,278 GBP
A
Retailer 2
-
£1,403 GBP
View
Retailer 3
-
£1,403 GBP
View
Price last confirmed 8 days ago
A
Retailer 4
-
£1,416 GBP
View
B+
Retailer 5
-
£1,467 GBP
View
A
Retailer 6
-
£1,505 GBP
View
A
Retailer 7
-
£1,523 GBP
View
A
Retailer 8
-
£1,618 GBP
View
B+
Retailer 9
-
£1,902 GBP
View
Most Expensive
B
NZ Jewellers
99d9a3c3-9351-4950-8825-9db039e73134 · Nov 5
£3,421 GBP
$4,579 USD
View
9 more retailers have this diamond
Prices start from £1,278 GBPSave up to £2,143 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
£1,278 GBP