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1.55ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2557621269

Certificate GIA 2557621269

Diamond specifications and retailer prices

From £3,375 GBP
As of November 4, 2026
Save £4,301 GBP (56%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £7,677 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.55ct natural round diamond

This 1.55ct 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 2557621269. Listed at 9 retailers as of November 4, 2026, with prices from £3,375 to £7,677, a £4,301 spread on the same certified stone. NZ Jewellers lists it at £7,677. 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

1.55
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 2557621269
Dimensions7.30 × 7.36 × 4.59 mm
L/W Ratio1.01
Key to symbols
Crystal, Cloud, Needle
Top View
7.30 mm7.36 mm1.55 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557621269
Side View
Table 59.0%CrownGirdle: Slightly ThickPavilion 41.2°Culet: NoneDepth 62.6%

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 4
Current: £7,677 GBP|Low: £3,375 GBP|High: £8,142 GBP|Avg: £4,995 GBP|-5.7%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 5, 2026
Retailer 7£3,375 GBP
Retailer 5£3,833 GBP
Retailer 9£3,938 GBP
Retailer 8£4,022 GBP
Retailer 3£4,589 GBP
Retailer 6£4,589 GBP
Retailer 2£4,983 GBP
Retailer 4£6,743 GBP
NZ Jewellers£7,677 GBP

39 data points across 9 retailers

9 retailers£3,375 GBP to £7,677 GBP

A
Cheapest Retailer
-
£3,375 GBP
A
Retailer 2
-
£3,833 GBP
View
Retailer 3
-
£3,938 GBP
View
Price last confirmed 10 days ago
A
Retailer 4
-
£4,022 GBP
View
B+
Retailer 5
-
£4,589 GBP
View
B+
Retailer 6
-
£4,589 GBP
View
B+
Retailer 7
-
£4,983 GBP
View
B
Retailer 8
-
£6,743 GBP
View
Most Expensive
B
NZ Jewellers
706c909f-4d06-495a-abc7-7b084a6df80a · Nov 5
£7,677 GBP
$10,275 USD
View
8 more retailers have this diamond
Prices start from £3,375 GBPSave up to £4,301 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
1.55ct Round
£3,375 GBP