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Round|Natural|GIA

1.55ct M SI1 Round Natural Diamond

EX • M/SI1 • GIA 6551332767

Certificate GIA 6551332767

Diamond specifications and retailer prices

From £1,179 GBP
As of November 4, 2026
Save £2,106 GBP (64%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £3,285 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 M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6551332767. Listed at 8 retailers as of November 4, 2026, with prices from £1,179 to £3,285, a £2,106 spread on the same certified stone. NZ Jewellers lists it at £3,285. 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
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 6551332767
Dimensions7.36 × 7.42 × 4.62 mm
L/W Ratio1.01
Key to symbols
Crystal, Needle, Indented Natural
Top View
7.36 mm7.42 mm1.55 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 6551332767
Side View
Table 59.0%CrownGirdlePavilionCuletDepth 62.5%

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: £3,285 GBP|Low: £1,169 GBP|High: £3,450 GBP|Avg: £1,856 GBP|-4.8%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 4£1,179 GBP
Retailer 6£1,433 GBP
Retailer 7£1,571 GBP
Retailer 5£1,643 GBP
Retailer 9£1,650 GBP
Retailer 2£1,711 GBP
Retailer 8£1,813 GBP
Retailer 3£2,132 GBP
NZ Jewellers£3,285 GBP

42 data points across 9 retailers

8 retailers£1,179 GBP to £3,285 GBP

A
Cheapest Retailer
-
£1,179 GBP
B+
Retailer 2
-
£1,433 GBP
View
B+
Retailer 3
-
£1,571 GBP
View
B+
Retailer 4
-
£1,643 GBP
View
B+
Retailer 5
-
£1,711 GBP
View
B+
Retailer 6
-
£1,813 GBP
View
B+
Retailer 7
-
£2,132 GBP
View
Most Expensive
B
NZ Jewellers
76b289ab-a5c6-4a5f-a7d7-07e20680fbd6 · Nov 5
£3,285 GBP
$4,421 USD
View
7 more retailers have this diamond
Prices start from £1,179 GBPSave up to £2,106 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
£1,179 GBP