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Heart|Natural|GIA

1.51ct I SI2 Heart Natural Diamond

EX • I/SI2 • GIA 6395991628

Certificate GIA 6395991628

Diamond specifications and retailer prices

From £3,281 GBP
As of November 2, 2026
Save £3,865 GBP (54%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £7,146 GBP at NZ Jewellers · As of October 30, 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 SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6395991628. Listed at 17 retailers as of October 30, 2026, with prices from £3,281 to £7,146, a £3,865 spread on the same certified stone. NZ Jewellers lists it at £7,146. 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
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6395991628
Dimensions7.21 × 7.86 × 4.42 mm
L/W Ratio1.09
Top View
7.21 mm7.86 mm1.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6395991628
Side View
Table 60.0%CrownGirdle: THN-VTKPavilionCulet: NoneDepth 56.3%

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 2
Current: £7,146 GBP|Low: £3,201 GBP|High: £7,146 GBP|Avg: £4,834 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 2, 2026
Retailer 4£3,281 GBP
Retailer 7£3,321 GBP
Retailer 2£4,067 GBP
Retailer 6£4,273 GBP
Retailer 3£4,834 GBP
Retailer 5£6,678 GBP
NZ Jewellers£7,146 GBP

44 data points across 7 retailers

17 retailers£3,281 GBP to £7,146 GBP

A
Cheapest Retailer
-
£3,281 GBP
B+
Retailer 2
-
£3,321 GBP
$4,450 USD
View
B+
Retailer 3
-
£3,523 GBP
$4,720 USD
View
B+
Retailer 4
-
£3,523 GBP
$4,720 USD
View
B+
Retailer 5
-
£3,615 GBP
$4,844 USD
View
B+
Retailer 6
-
£3,642 GBP
$4,880 USD
View
B+
Retailer 7
-
£3,726 GBP
$4,993 USD
View
B+
Retailer 8
-
£4,067 GBP
View
B
Retailer 9
-
£4,219 GBP
$5,653 USD
View
B
Retailer 10
-
£4,273 GBP
$5,725 USD
View
B
Retailer 11
-
£4,273 GBP
$5,725 USD
View
B
Retailer 12
-
£4,273 GBP
$5,725 USD
View
B
Retailer 13
-
£4,388 GBP
$5,880 USD
View
B+
Retailer 14
-
£4,834 GBP
€6,169 EUR
View
B
Retailer 15
-
£4,930 GBP
$6,605 USD
View
B
Retailer 16
-
£6,678 GBP
View
Most Expensive
B
NZ Jewellers
1fc45747-6b72-4cb9-9f11-25bbf6aa3c05 · Oct 30
£7,146 GBP
$9,575 USD
View
16 more retailers have this diamond
Prices start from £3,281 GBPSave up to £3,865 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
£3,281 GBP