Round|Natural|GIA

0.55ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 6551409149

Certificate GIA 6551409149

Diamond specifications and retailer prices

From £451 GBP
As of November 4, 2026
Save £616 GBP (58%) vs most expensive(unlock to see where)
26 retailers carry this diamond
Most expensive: £1,830 GBP at NZ Jewellers · As of October 17, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6551409149. Listed at 26 retailers as of November 4, 2026, with a 137% 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6551409149
Dimensions5.21 × 5.24 × 3.27 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Twinning Wisp, Cloud, Crystal
Top View
5.21 mm5.24 mm0.55 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551409149
Side View
Table 56.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°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: £750 GBP|Low: £451 GBP|High: £1,082 GBP|Avg: £753 GBP|-0.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 7£451 GBP
Retailer 9£556 GBP
Retailer 6£661 GBP
Retailer 2£691 GBP
Retailer 1£750 GBP
Retailer 3£751 GBP
Retailer 8£877 GBP
Retailer 4£901 GBP
Retailer 5£1,067 GBP

44 data points across 9 retailers

26 retailers£451 GBP to £1,067 GBP

A
Cheapest Retailer
-
£451 GBP
Final sale: no returns
A
Retailer 2
-
£485 GBP
View
Retailer 3
-
£519 GBP
View
Price last confirmed 26 days ago
Retailer 4
-
£529 GBP
View
Price last confirmed 67 days ago
Retailer 5
-
£529 GBP
View
Price last confirmed 21 days ago
B+
Retailer 6
-
£536 GBP
View
B+
Retailer 7
-
£544 GBP
View
B+
Retailer 8
-
£549 GBP
View
B+
Retailer 9
-
£556 GBP
View
B+
Retailer 10
-
£609 GBP
View
Retailer 11
-
£610 GBP
View
Price last confirmed 45 days ago
B+
Retailer 12
-
£651 GBP
View
B+
Retailer 13
-
£654 GBP
View
B+
Retailer 14
-
£654 GBP
View
B+
Retailer 15
-
£661 GBP
View
B+
Retailer 16
-
£676 GBP
View
B
Retailer 17
-
£691 GBP
View
B
Retailer 18
-
£714 GBP
View
B+
Retailer 19
-
£750 GBP
View
B+
Retailer 20
-
£751 GBP
View
B
Retailer 21
-
£818 GBP
View
Retailer 22
-
£877 GBP
View
Price last confirmed 33 days ago
B
Retailer 23
-
£901 GBP
View
B
Retailer 24
-
£937 GBP
View
B
Retailer 25
-
£1,067 GBP
View
Most Expensive
NZ Jewellers
9b4a09a1-bca8-48c8-abbe-fa20ccd6310f · Oct 17
£1,830 GBP
$2,463 USD
View
Price under review
25 more retailers have this diamond
Prices start from £451 GBPSave up to £616 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
£451 GBP