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Round|Natural|GIA

1.55ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1553168978

Certificate GIA 1553168978

Diamond specifications and retailer prices

From £4,427 GBP
As of November 6, 2026
Save £2,661 GBP (38%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £7,832 GBP at MOH London · As of October 21, 2026
View at MOH London

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 1553168978. Listed at 22 retailers as of November 5, 2026, with a 60% 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

1.55
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 1553168978
Dimensions7.56 × 7.60 × 4.51 mm
L/W Ratio1.01
Girdle conditionThin to Medium
Culet sizeNone
Top View
7.56 mm7.60 mm1.55 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1553168978
Side View
Table 62.0%Crown 33.5°Girdle: THN-MEDPavilion 41.6°Culet: NoneDepth 59.4%

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: £7,832 GBP|Low: £4,258 GBP|High: £7,884 GBP|Avg: £5,646 GBP|-0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
Retailer 20
November 6, 2026
Retailer 8£4,261 GBP
Retailer 14£4,427 GBP
Retailer 13£4,504 GBP
Retailer 9£4,632 GBP
Retailer 2£4,767 GBP
Retailer 3£4,875 GBP
Retailer 10£5,160 GBP
Retailer 20£5,285 GBP
Retailer 11£5,444 GBP
Retailer 18£5,526 GBP
Retailer 12£5,589 GBP
Retailer 6£5,730 GBP
Retailer 16£5,730 GBP
Retailer 19£5,917 GBP
Retailer 5£5,973 GBP
Retailer 17£6,282 GBP
Retailer 15£6,338 GBP
Retailer 7£6,474 GBP
Retailer 4£7,089 GBP
MOH London£7,832 GBP

26 data points across 20 retailers

22 retailers£4,427 GBP to £7,089 GBP

Retailer 1
-
£4,112 GBP
Price last confirmed 18 days ago
B+
Retailer 2
-
£4,427 GBP
View
B+
Retailer 3
-
£4,504 GBP
View
Retailer 4
-
£4,569 GBP
View
Price last confirmed 37 days ago
Retailer 5
-
£4,632 GBP
View
Price last confirmed 20 days ago
B+
Retailer 6
-
£4,767 GBP
View
Final sale: no returns
B+
Retailer 7
-
£4,875 GBP
View
Retailer 8
-
£5,160 GBP
View
Price last confirmed 26 days ago
B+
Retailer 9
-
£5,285 GBP
View
Retailer 10
-
£5,444 GBP
View
Price last confirmed 34 days ago
B+
Retailer 11
-
£5,526 GBP
View
Retailer 12
-
£5,589 GBP
View
Price last confirmed 30 days ago
Retailer 13
-
£5,675 GBP
View
Price last confirmed 39 days ago
B
Retailer 14
-
£5,730 GBP
View
B
Retailer 15
-
£5,730 GBP
View
B+
Retailer 16
-
£5,917 GBP
View
B+
Retailer 17
-
£5,973 GBP
View
B
Retailer 18
-
£6,282 GBP
View
B
Retailer 19
-
£6,338 GBP
View
Retailer 20
-
£6,449 GBP
View
Price last confirmed 39 days ago
B
Retailer 21
-
£7,089 GBP
View
Most Expensive
MOH London
ADCE41C9E · Oct 21
£7,832 GBP
View
Price last confirmed 16 days ago
21 more retailers have this diamond
Prices start from £4,427 GBPSave up to £2,661 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
£4,427 GBP