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Round|Natural|GIA

1.51ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 2557586665

Certificate GIA 2557586665

Diamond specifications and retailer prices

From £3,926 GBP
HK$41,100 HKD
As of November 1, 2026
Save £4,988 GBP (56%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £8,914 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2557586665. Listed at 17 retailers as of October 30, 2026, with prices from £3,926 to £8,914, a £4,988 spread on the same certified stone. NZ Jewellers lists it at £8,914. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 2557586665
Dimensions7.25 × 7.31 × 4.56 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Twinning Wisp, Crystal, Feather, Needle
Top View
7.25 mm7.31 mm1.51 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557586665
Side View
Table 59.0%Crown 35°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.7%

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 1
Current: £8,914 GBP|Low: £3,864 GBP|High: £8,914 GBP|Avg: £5,514 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
November 1, 2026
Retailer 12£3,926 GBP
Retailer 16£3,944 GBP
Retailer 5£4,212 GBP
Retailer 7£4,456 GBP
Retailer 3£4,829 GBP
Retailer 6£4,829 GBP
Retailer 15£4,829 GBP
Retailer 11£5,077 GBP
Retailer 13£5,324 GBP
Retailer 8£5,366 GBP
Retailer 17£5,366 GBP
Retailer 14£5,545 GBP
Retailer 4£5,571 GBP
Retailer 9£5,874 GBP
Retailer 2£6,437 GBP
Retailer 10£7,853 GBP
NZ Jewellers£8,914 GBP

38 data points across 17 retailers

17 retailers£3,926 GBP to £8,914 GBP

A
Cheapest Retailer
-
£3,926 GBP
HK$41,100 HKD
A
Retailer 2
-
£3,944 GBP
$5,285 USD
View
B+
Retailer 3
-
£4,212 GBP
$5,643 USD
View
B+
Retailer 4
-
£4,456 GBP
$5,971 USD
View
Final sale: no returns
B+
Retailer 5
-
£4,829 GBP
$6,470 USD
View
B+
Retailer 6
-
£4,829 GBP
$6,470 USD
View
B+
Retailer 7
-
£4,829 GBP
$6,470 USD
View
B+
Retailer 8
-
£5,077 GBP
View
B+
Retailer 9
-
£5,324 GBP
€6,794 EUR
View
B
Retailer 10
-
£5,366 GBP
$7,190 USD
View
B+
Retailer 11
-
£5,366 GBP
$7,190 USD
View
B
Retailer 12
-
£5,545 GBP
$7,430 USD
View
B
Retailer 13
-
£5,571 GBP
$7,465 USD
View
Retailer 14
-
£5,874 GBP
$7,871 USD
View
Price last confirmed 9 days ago
B
Retailer 15
-
£6,437 GBP
View
B
Retailer 16
-
£7,853 GBP
View
Most Expensive
B
NZ Jewellers
1b7dad14-d83a-4a6a-990d-39a4c693f98f · Oct 30
£8,914 GBP
$11,944 USD
View
16 more retailers have this diamond
Prices start from £3,926 GBPSave up to £4,988 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
£3,926 GBP