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Round|Natural|GIA

1.55ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2554628290

Certificate GIA 2554628290

Diamond specifications and retailer prices

From £4,876 GBP
As of November 6, 2026
Save £4,485 GBP (48%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £9,361 GBP at NZ Jewellers · As of November 2, 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 2554628290. Listed at 10 retailers as of November 2, 2026, with prices from £4,876 to £9,361, a £4,485 spread on the same certified stone. NZ Jewellers lists it at £9,361. 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
Crown angle34.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 2554628290
Dimensions7.34 × 7.39 × 4.62 mm
L/W Ratio1.01
Girdle conditionSlightly Thick
Key to symbols
Crystal, Feather, Needle
Top View
7.34 mm7.39 mm1.55 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2554628290
Side View
Table 58.0%Crown 34.5°Girdle: STK-STKPavilion 41.6°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: Nov 6
Current: £9,361 GBP|Low: £4,457 GBP|High: £9,361 GBP|Avg: £5,918 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
November 6, 2026
Retailer 3£4,457 GBP
Retailer 6£4,876 GBP
Retailer 13£4,885 GBP
Retailer 8£5,170 GBP
Retailer 9£5,597 GBP
Retailer 7£5,612 GBP
Retailer 11£5,683 GBP
Retailer 5£6,095 GBP
Retailer 12£6,266 GBP
Retailer 2£6,300 GBP
Retailer 4£7,098 GBP
Retailer 10£7,881 GBP
NZ Jewellers£9,361 GBP

14 data points across 13 retailers

10 retailers£4,876 GBP to £9,361 GBP

Retailer 1
-
£4,457 GBP
Price last confirmed 19 days ago
B+
Retailer 2
-
£4,876 GBP
View
B+
Retailer 3
-
£5,170 GBP
View
B+
Retailer 4
-
£5,597 GBP
View
B+
Retailer 5
-
£5,612 GBP
View
B
Retailer 6
-
£5,683 GBP
View
B
Retailer 7
-
£6,266 GBP
View
B+
Retailer 8
-
£6,300 GBP
View
B
Retailer 9
-
£7,881 GBP
View
Most Expensive
B
NZ Jewellers
487b5f42-6e04-4b45-8b32-98f9a897b104 · Nov 2
£9,361 GBP
$12,530 USD
View
9 more retailers have this diamond
Prices start from £4,876 GBPSave up to £4,485 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+
1.55ct Round
£4,876 GBP