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Round|Natural|GIA

1.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6545694423

Certificate GIA 6545694423

Diamond specifications and retailer prices

From £4,188 GBP
As of November 6, 2026
Save £5,360 GBP (56%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £9,548 GBP at NZ Jewellers · As of November 5, 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 6545694423. Listed at 19 retailers as of November 5, 2026, with prices from £4,188 to £9,548, a £5,360 spread on the same certified stone. NZ Jewellers lists it at £9,548. 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 angle35°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6545694423
Dimensions7.33 × 7.35 × 4.52 mm
L/W Ratio1.00
Top View
7.33 mm7.35 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6545694423
Side View
Table 57.0%Crown 35°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.6%

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 6
Current: £9,548 GBP|Low: £4,150 GBP|High: £9,548 GBP|Avg: £5,866 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
November 6, 2026
Retailer 16£4,188 GBP
Retailer 7£4,510 GBP
Retailer 5£4,774 GBP
Retailer 9£4,774 GBP
Retailer 18£4,793 GBP
Retailer 4£5,172 GBP
Retailer 8£5,251 GBP
Retailer 12£5,293 GBP
Retailer 17£5,504 GBP
Retailer 15£5,653 GBP
Retailer 6£5,968 GBP
Retailer 10£6,291 GBP
Retailer 11£6,291 GBP
Retailer 3£6,403 GBP
Retailer 2£6,926 GBP
Retailer 13£6,965 GBP
Retailer 14£7,935 GBP
NZ Jewellers£9,548 GBP

33 data points across 18 retailers

19 retailers£4,188 GBP to £9,548 GBP

A
Cheapest Retailer
-
£4,188 GBP
B+
Retailer 2
-
£4,507 GBP
View
B+
Retailer 3
-
£4,510 GBP
View
B+
Retailer 4
-
£4,774 GBP
View
Final sale: no returns
Retailer 5
-
£4,774 GBP
View
Price last confirmed 8 days ago
B+
Retailer 6
-
£4,793 GBP
View
B+
Retailer 7
-
£5,172 GBP
View
B+
Retailer 8
-
£5,251 GBP
View
B+
Retailer 9
-
£5,293 GBP
View
Retailer 10
-
£5,504 GBP
View
Price last confirmed 15 days ago
B+
Retailer 11
-
£5,653 GBP
View
B+
Retailer 12
-
£5,968 GBP
View
Retailer 13
-
£6,291 GBP
View
Price last confirmed 14 days ago
B+
Retailer 14
-
£6,291 GBP
View
B
Retailer 15
-
£6,403 GBP
View
B
Retailer 16
-
£6,926 GBP
View
B
Retailer 17
-
£6,965 GBP
View
B
Retailer 18
-
£7,935 GBP
View
Most Expensive
B
NZ Jewellers
7238d773-89f0-446b-9262-05b231d63538 · Nov 5
£9,548 GBP
$12,780 USD
View
18 more retailers have this diamond
Prices start from £4,188 GBPSave up to £5,360 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
£4,188 GBP