Round|Natural|GIA

0.55ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 6431478289

Certificate GIA 6431478289

Diamond specifications and retailer prices

From £370 GBP
As of November 5, 2026
Save £379 GBP (51%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £1,268 GBP at NZ Jewellers · As of September 19, 2026
View at NZ Jewellers

About this 0.55ct natural round diamond

This 0.55ct natural round sits in the half to three-quarter carat band, graded H colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6431478289. Listed at 13 retailers as of November 2, 2026, with a 102% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

0.55
Carat
H
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6431478289
Dimensions5.26 × 5.23 × 3.26 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
5.26 mm5.23 mm0.55 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6431478289
Side View
Table 58.0%Crown 36.5°Girdle: MediumPavilion 41°Culet: NoneDepth 62.3%

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 5
Current: £1,244 GBP|Low: £310 GBP|High: £1,268 GBP|Avg: £527 GBP|-1.9%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 5, 2026
Retailer 6£325 GBP
Retailer 8£364 GBP
Retailer 2£370 GBP
Retailer 4£397 GBP
Retailer 7£464 GBP
Retailer 9£477 GBP
Retailer 3£489 GBP
Retailer 5£749 GBP
NZ Jewellers£1,244 GBP

40 data points across 9 retailers

13 retailers£370 GBP to £749 GBP

Retailer 1
-
£325 GBP
Price last confirmed 17 days ago
Retailer 2
-
£331 GBP
View
Price last confirmed 50 days ago
Retailer 3
-
£356 GBP
View
Price last confirmed 22 days ago
Retailer 4
-
£356 GBP
View
Price last confirmed 21 days ago
A
Retailer 5
-
£370 GBP
View
Retailer 6
-
£382 GBP
View
Price last confirmed 45 days ago
A
Retailer 7
-
£397 GBP
View
A
Retailer 8
-
£464 GBP
View
A
Retailer 9
-
£477 GBP
View
A
Retailer 10
-
£489 GBP
View
B+
Retailer 11
-
£749 GBP
View
Retailer 12
-
£1,244 GBP
View
Price last confirmed 17 days ago
Most Expensive
NZ Jewellers
d81b8347-16aa-44c2-adee-9164ef3bf060 · Sep 19
£1,268 GBP
$1,706 USD
View
Price last confirmed 47 days ago
12 more retailers have this diamond
Prices start from £370 GBPSave up to £379 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
0.55ct Round
£370 GBP