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Round|Natural|GIA

1.51ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 6425906823

Certificate GIA 6425906823

Diamond specifications and retailer prices

From £3,582 GBP
HK$37,500 HKD
As of November 1, 2026
Save £4,558 GBP (56%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £8,140 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.51ct natural round diamond

This 1.51ct natural round 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 and certified by GIA 6425906823. Listed at 19 retailers as of October 30, 2026, with prices from £3,582 to £8,140, a £4,558 spread on the same certified stone. NZ Jewellers lists it at £8,140. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6425906823
Dimensions7.31 × 7.27 × 4.55 mm
L/W Ratio1.01
Top View
7.31 mm7.27 mm1.51 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6425906823
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.4%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £8,140 GBP|Low: £3,522 GBP|High: £8,140 GBP|Avg: £5,055 GBP
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
Retailer 17
Retailer 18
Retailer 19
November 2, 2026
Retailer 15£3,582 GBP
Retailer 18£3,851 GBP
Retailer 5£4,070 GBP
Retailer 16£4,105 GBP
Retailer 6£4,409 GBP
Retailer 8£4,409 GBP
Retailer 19£4,409 GBP
Retailer 2£4,599 GBP
Retailer 7£4,918 GBP
Retailer 9£4,918 GBP
Retailer 11£4,920 GBP
Retailer 10£4,984 GBP
Retailer 17£5,083 GBP
Retailer 3£5,088 GBP
Retailer 12£5,294 GBP
Retailer 4£5,365 GBP
Retailer 14£5,980 GBP
Retailer 13£7,170 GBP
NZ Jewellers£8,140 GBP

43 data points across 19 retailers

19 retailers£3,582 GBP to £8,140 GBP

B+
Cheapest Retailer
-
£3,582 GBP
HK$37,500 HKD
B+
Retailer 2
-
£3,851 GBP
$5,160 USD
View
B
Retailer 3
-
£4,070 GBP
$5,453 USD
View
Final sale: no returns
B
Retailer 4
-
£4,105 GBP
$5,500 USD
View
B
Retailer 5
-
£4,409 GBP
$5,908 USD
View
B
Retailer 6
-
£4,409 GBP
$5,908 USD
View
B
Retailer 7
-
£4,409 GBP
$5,908 USD
View
B+
Retailer 8
-
£4,599 GBP
View
B
Retailer 9
-
£4,918 GBP
$6,590 USD
View
B
Retailer 10
-
£4,918 GBP
$6,590 USD
View
Retailer 11
-
£4,920 GBP
A$10,142 AUD
View
Price last confirmed 29 days ago
B
Retailer 12
-
£4,984 GBP
$6,679 USD
View
B
Retailer 13
-
£5,083 GBP
$6,810 USD
View
B
Retailer 14
-
£5,088 GBP
$6,817 USD
View
B
Retailer 15
-
£5,294 GBP
€6,756 EUR
View
Retailer 16
-
£5,365 GBP
$7,189 USD
View
Price last confirmed 10 days ago
B
Retailer 17
-
£5,980 GBP
ZAR 129,441 ZAR
View
B
Retailer 18
-
£7,170 GBP
View
Most Expensive
B
NZ Jewellers
69390dd0-34a5-44b5-99bc-6831c853a27d · Oct 30
£8,140 GBP
$10,907 USD
View
18 more retailers have this diamond
Prices start from £3,582 GBPSave up to £4,558 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.

B+
1.51ct Round
£3,582 GBP