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Heart|Natural|GIA

1.51ct J SI1 Heart Natural Diamond

ID • J/SI1 • GIA 6521863768

Certificate GIA 6521863768

Diamond specifications and retailer prices

From £2,630 GBP
As of November 6, 2026
Save £2,994 GBP (53%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £6,454 GBP at NZ Jewellers · As of September 28, 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 J 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 6521863768. Listed at 20 retailers as of November 4, 2026, with a 114% 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
J
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 6521863768
Dimensions6.88 × 8.00 × 4.76 mm
L/W Ratio1.16
Top View
6.88 mm8.00 mm1.51 ctJ / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6521863768
Side View
Table 60.0%Crown 34.6°Girdle: MD-VTKPavilion 41.6°Culet: NoneDepth 59.5%

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: £6,168 GBP|Low: £2,601 GBP|High: £6,454 GBP|Avg: £3,797 GBP|-4.4%
NZ Jewellers
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 6, 2026
Retailer 11£2,630 GBP
Retailer 7£3,023 GBP
Retailer 15£3,088 GBP
Retailer 3£3,148 GBP
Retailer 13£3,268 GBP
Retailer 6£3,338 GBP
Retailer 12£3,340 GBP
Retailer 2£3,486 GBP
Retailer 14£3,541 GBP
Retailer 16£3,569 GBP
Retailer 5£3,653 GBP
Retailer 8£3,704 GBP
Retailer 4£4,085 GBP
Retailer 9£4,320 GBP
Retailer 10£5,623 GBP
NZ Jewellers£6,168 GBP

44 data points across 16 retailers

20 retailers£2,630 GBP to £5,623 GBP

A
Cheapest Retailer
-
£2,630 GBP
Retailer 2
-
£3,023 GBP
View
Price last confirmed 20 days ago
B+
Retailer 3
-
£3,088 GBP
View
B+
Retailer 4
-
£3,148 GBP
View
B+
Retailer 5
-
£3,268 GBP
View
Final sale: no returns
Retailer 6
-
£3,338 GBP
View
Price last confirmed 12 days ago
B+
Retailer 7
-
£3,340 GBP
View
B+
Retailer 8
-
£3,486 GBP
View
Retailer 9
-
£3,541 GBP
View
Price last confirmed 22 days ago
Retailer 10
-
£3,541 GBP
View
Price last confirmed 18 days ago
Retailer 11
-
£3,541 GBP
View
Price last confirmed 22 days ago
Retailer 12
-
£3,569 GBP
View
Price last confirmed 29 days ago
B+
Retailer 13
-
£3,653 GBP
View
Retailer 14
-
£3,704 GBP
View
Price last confirmed 45 days ago
Retailer 15
-
£4,085 GBP
View
Price last confirmed 17 days ago
Retailer 16
-
£4,274 GBP
View
Price last confirmed 39 days ago
B
Retailer 17
-
£4,320 GBP
View
B
Retailer 18
-
£5,623 GBP
View
Retailer 19
-
£6,168 GBP
View
Price last confirmed 17 days ago
Most Expensive
NZ Jewellers
91a3da5e-28a1-40c3-b827-2b2d66af564d · Sep 28
£6,454 GBP
$8,638 USD
View
Price last confirmed 39 days ago
19 more retailers have this diamond
Prices start from £2,630 GBPSave up to £2,994 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
£2,630 GBP