Round|Natural|GIA

1.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1533904580

Certificate GIA 1533904580

Diamond specifications and retailer prices

From £3,707 GBP
HK$38,800 HKD
As of October 31, 2026
Save £3,652 GBP (50%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £8,354 GBP at NZ Jewellers · As of September 28, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1533904580. Listed at 21 retailers as of October 31, 2026, with a 99% 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1533904580
Dimensions7.28 × 7.24 × 4.55 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
Clouds are not shown. Pinpoints are not shown.
Key to symbols
Crystal, Feather, Needle, Indented Natural, Natural
Top View
7.28 mm7.24 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1533904580
Side View
Table 57.0%Crown 36°Girdle: STK-STKPavilion 40.6°Culet: NoneDepth 62.8%

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: Oct 31
Current: £5,535 GBP|Low: £3,707 GBP|High: £7,447 GBP|Avg: £5,425 GBP|-1.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 1, 2026
Retailer 6£3,707 GBP
Retailer 9£4,348 GBP
Retailer 8£4,609 GBP
Retailer 4£4,759 GBP
Retailer 7£4,875 GBP
Retailer 3£5,433 GBP
Retailer 1£5,535 GBP
Retailer 5£6,137 GBP
Retailer 2£7,359 GBP

39 data points across 9 retailers

21 retailers£3,707 GBP to £7,359 GBP

A
Cheapest Retailer
-
£3,707 GBP
HK$38,800 HKD
Retailer 2
-
£4,229 GBP
SGD 7,658 SGD
View
Price last confirmed 18 days ago
B+
Retailer 3
-
£4,348 GBP
$5,826 USD
View
B+
Retailer 4
-
£4,356 GBP
$5,836 USD
View
Retailer 5
-
£4,529 GBP
$6,068 USD
View
Price last confirmed 104 days ago
B+
Retailer 6
-
£4,609 GBP
$6,176 USD
View
Final sale: no returns
Retailer 7
-
£4,611 GBP
$6,178 USD
View
Price last confirmed 24 days ago
B+
Retailer 8
-
£4,635 GBP
$6,210 USD
View
B+
Retailer 9
-
£4,759 GBP
View
Retailer 10
-
£4,875 GBP
A$10,049 AUD
View
Price last confirmed 19 days ago
B+
Retailer 11
-
£4,964 GBP
$6,652 USD
View
Retailer 12
-
£4,994 GBP
$6,692 USD
View
Price last confirmed 24 days ago
Retailer 13
-
£5,071 GBP
$6,795 USD
View
Price last confirmed 32 days ago
B+
Retailer 14
-
£5,114 GBP
$6,852 USD
View
B
Retailer 15
-
£5,433 GBP
€6,933 EUR
View
B+
Retailer 16
-
£5,535 GBP
View
Retailer 17
-
£5,763 GBP
$7,722 USD
View
Price last confirmed 55 days ago
Retailer 18
-
£5,763 GBP
$7,722 USD
View
Price last confirmed 23 days ago
B+
Retailer 19
-
£6,137 GBP
ZAR 132,836 ZAR
View
B
Retailer 20
-
£7,359 GBP
View
Most Expensive
NZ Jewellers
2e3019be-6bad-462a-ae34-2634988fc2a2 · Sep 28
£8,354 GBP
$11,193 USD
View
Price last confirmed 34 days ago
20 more retailers have this diamond
Prices start from £3,707 GBPSave up to £3,652 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 Round
£3,707 GBP