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Heart|Natural|GIA

1.51ct I SI1 Heart Natural Diamond

ID • I/SI1 • GIA 1535629313

Certificate GIA 1535629313

Diamond specifications and retailer prices

From £2,601 GBP
As of November 6, 2026
Save £2,801 GBP (52%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £6,025 GBP at NZ Jewellers · As of October 18, 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 1535629313. Listed at 19 retailers as of November 4, 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
I
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1535629313
Dimensions7.99 × 7.02 × 4.65 mm
L/W Ratio1.14
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle
Top View
7.99 mm7.02 mm1.51 ctI / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1535629313
Side View
Table 58.0%CrownGirdle: STK-THKPavilionCulet: 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: £2,762 GBP|Low: £2,591 GBP|High: £5,575 GBP|Avg: £3,496 GBP|-3.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 10£2,601 GBP
Retailer 1£2,762 GBP
Retailer 7£3,100 GBP
Retailer 2£3,139 GBP
Retailer 4£3,306 GBP
Retailer 5£3,444 GBP
Retailer 9£3,489 GBP
Retailer 3£3,509 GBP
Retailer 11£3,512 GBP
Retailer 6£4,149 GBP
Retailer 8£5,402 GBP

33 data points across 11 retailers

19 retailers£2,601 GBP to £5,402 GBP

A
Cheapest Retailer
-
£2,601 GBP
A
Retailer 2
-
£2,762 GBP
View
A
Retailer 3
-
£3,100 GBP
View
A
Retailer 4
-
£3,139 GBP
View
Final sale: no returns
B+
Retailer 5
-
£3,206 GBP
View
B+
Retailer 6
-
£3,209 GBP
View
B+
Retailer 7
-
£3,306 GBP
View
B+
Retailer 8
-
£3,393 GBP
View
B+
Retailer 9
-
£3,444 GBP
View
Retailer 10
-
£3,458 GBP
View
Price last confirmed 22 days ago
Retailer 11
-
£3,458 GBP
View
Price last confirmed 22 days ago
Retailer 12
-
£3,458 GBP
View
Price last confirmed 20 days ago
B+
Retailer 13
-
£3,489 GBP
View
Retailer 14
-
£3,509 GBP
View
Price last confirmed 29 days ago
B+
Retailer 15
-
£3,512 GBP
View
Retailer 16
-
£3,991 GBP
View
Price last confirmed 19 days ago
B+
Retailer 17
-
£4,149 GBP
View
B
Retailer 18
-
£5,402 GBP
View
Most Expensive
NZ Jewellers
a8878e84-ef46-4992-b67a-8eceeb60932b · Oct 18
£6,025 GBP
$8,065 USD
View
Price last confirmed 20 days ago
18 more retailers have this diamond
Prices start from £2,601 GBPSave up to £2,801 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
£2,601 GBP