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Round|Natural|GIA

1.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1499381589

Certificate GIA 1499381589

Diamond specifications and retailer prices

From £5,703 GBP
$7,641 USD
As of October 30, 2026
Save £6,478 GBP (53%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £12,181 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1499381589. Listed at 19 retailers as of October 30, 2026, with prices from £5,703 to £12,181, a £6,478 spread on the same certified stone. NZ Jewellers lists it at £12,181. 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
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1499381589
Dimensions7.30 × 7.28 × 4.57 mm
L/W Ratio1.00
Star length55%
Lower girdle75%
Cert comments
Additional clouds are not shown. Pinpoints are not shown.
Key to symbols
Feather, Cloud
Top View
7.30 mm7.28 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1499381589
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.7%

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 30
Current: £10,149 GBP|Low: £6,091 GBP|High: £10,272 GBP|Avg: £7,738 GBP|-1.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 7£6,091 GBP
Retailer 4£6,699 GBP
Retailer 8£6,700 GBP
Retailer 6£6,729 GBP
Retailer 3£7,923 GBP
Retailer 2£8,071 GBP
Retailer 5£8,947 GBP
Retailer 1£10,149 GBP

36 data points across 8 retailers

19 retailers£5,703 GBP to £12,181 GBP

Retailer 1
-
£5,218 GBP
$6,991 USD
Price last confirmed 70 days ago
B+
Retailer 2
-
£5,703 GBP
$7,641 USD
View
B+
Retailer 3
-
£6,060 GBP
$8,120 USD
View
B+
Retailer 4
-
£6,091 GBP
$8,161 USD
View
B
Retailer 5
-
£6,091 GBP
$8,161 USD
View
Final sale: no returns
B
Retailer 6
-
£6,598 GBP
$8,841 USD
View
B+
Retailer 7
-
£6,699 GBP
View
B
Retailer 8
-
£6,700 GBP
$8,977 USD
View
Retailer 9
-
£6,729 GBP
A$13,871 AUD
View
Price last confirmed 9 days ago
B
Retailer 10
-
£7,217 GBP
$9,670 USD
View
B
Retailer 11
-
£7,217 GBP
$9,670 USD
View
B
Retailer 12
-
£7,456 GBP
$9,990 USD
View
B
Retailer 13
-
£7,613 GBP
$10,201 USD
View
B
Retailer 14
-
£7,923 GBP
€10,111 EUR
View
Retailer 15
-
£8,019 GBP
$10,744 USD
View
Price last confirmed 9 days ago
B
Retailer 16
-
£8,071 GBP
View
B
Retailer 17
-
£8,947 GBP
ZAR 193,676 ZAR
View
B
Retailer 18
-
£10,149 GBP
View
Most Expensive
B
NZ Jewellers
1689698a-db4d-4d37-997d-21b4358c82c3 · Oct 30
£12,181 GBP
$16,321 USD
View
18 more retailers have this diamond
Prices start from £5,703 GBPSave up to £6,478 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
£5,703 GBP