Round|Natural|GIA

1.51ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 6501583878

Certificate GIA 6501583878

Diamond specifications and retailer prices

From £4,355 GBP
$5,835 USD
As of October 25, 2026
Save £4,930 GBP (53%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £9,284 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 6501583878. Listed at 18 retailers as of October 25, 2026, with prices from £4,355 to £9,284, a £4,930 spread on the same certified stone. NZ Jewellers lists it at £9,284. 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 angle33.5°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 6501583878
Dimensions7.35 × 7.30 × 4.60 mm
L/W Ratio1.01
Top View
7.35 mm7.30 mm1.51 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6501583878
Side View
Table 57.0%Crown 33.5°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 62.8%

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: Oct 25
Current: £6,820 GBP|Low: £4,355 GBP|High: £7,829 GBP|Avg: £5,643 GBP|+1.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 31, 2026
Retailer 9£4,355 GBP
Retailer 11£4,386 GBP
Retailer 10£4,665 GBP
Retailer 2£5,106 GBP
Retailer 5£5,198 GBP
Retailer 3£5,323 GBP
Retailer 8£5,388 GBP
Retailer 6£6,066 GBP
Retailer 4£6,650 GBP
Retailer 1£6,820 GBP
Retailer 7£7,778 GBP

36 data points across 11 retailers

18 retailers£4,355 GBP to £9,284 GBP

B+
Cheapest Retailer
-
£4,355 GBP
$5,835 USD
B+
Retailer 2
-
£4,386 GBP
$5,877 USD
View
B
Retailer 3
-
£4,642 GBP
$6,220 USD
View
B
Retailer 4
-
£4,665 GBP
$6,250 USD
View
B
Retailer 5
-
£4,948 GBP
$6,630 USD
View
B
Retailer 6
-
£5,029 GBP
$6,738 USD
View
B
Retailer 7
-
£5,106 GBP
$6,842 USD
View
B
Retailer 8
-
£5,198 GBP
View
B
Retailer 9
-
£5,323 GBP
$7,132 USD
View
Retailer 10
-
£5,388 GBP
A$11,106 AUD
View
Price last confirmed 10 days ago
Retailer 11
-
£5,803 GBP
$7,775 USD
View
Price last confirmed 55 days ago
B
Retailer 12
-
£5,803 GBP
$7,775 USD
View
B
Retailer 13
-
£6,066 GBP
€7,741 EUR
View
Retailer 14
-
£6,117 GBP
$8,196 USD
View
Price last confirmed 9 days ago
B
Retailer 15
-
£6,650 GBP
View
B
Retailer 16
-
£6,820 GBP
ZAR 147,633 ZAR
View
B
Retailer 17
-
£7,778 GBP
View
Most Expensive
B
NZ Jewellers
f4d4f422-75b9-49b3-bb55-82b45c3d718f · Oct 30
£9,284 GBP
$12,440 USD
View
17 more retailers have this diamond
Prices start from £4,355 GBPSave up to £4,930 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
£4,355 GBP