Round|Natural|GIA

1.55ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6485913336

Certificate GIA 6485913336

Diamond specifications and retailer prices

From £6,350 GBP
As of November 4, 2026
Save £5,274 GBP (45%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £15,824 GBP at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

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 6485913336. Listed at 16 retailers as of November 4, 2026, with a 83% 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 angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6485913336
Dimensions7.47 × 7.45 × 4.51 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Top View
7.47 mm7.45 mm1.55 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6485913336
Side View
Table 59.0%Crown 33.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 60.5%

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 4
Current: £7,505 GBP|Low: £5,812 GBP|High: £11,023 GBP|Avg: £8,308 GBP|-0.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 5£6,350 GBP
Retailer 7£6,974 GBP
Retailer 1£7,505 GBP
Retailer 6£7,671 GBP
Retailer 8£7,672 GBP
Retailer 3£8,731 GBP
Retailer 2£10,175 GBP
Retailer 4£10,863 GBP

44 data points across 8 retailers

16 retailers£6,350 GBP to £11,624 GBP

B+
Cheapest Retailer
-
£6,350 GBP
B+
Retailer 2
-
£6,530 GBP
View
B
Retailer 3
-
£6,911 GBP
View
Retailer 4
-
£6,974 GBP
View
Price last confirmed 8 days ago
B
Retailer 5
-
£6,974 GBP
View
Final sale: no returns
B
Retailer 6
-
£7,505 GBP
View
B
Retailer 7
-
£7,556 GBP
View
Retailer 8
-
£7,671 GBP
View
Price last confirmed 14 days ago
B
Retailer 9
-
£7,672 GBP
View
B
Retailer 10
-
£8,718 GBP
View
B
Retailer 11
-
£8,731 GBP
View
Retailer 12
-
£9,179 GBP
View
Price last confirmed 14 days ago
B
Retailer 13
-
£10,175 GBP
View
B
Retailer 14
-
£10,863 GBP
View
B
Retailer 15
-
£11,624 GBP
View
Most Expensive
Diamond Quarter
1.55SI1H6436AC2BN · Nov 5
£15,824 GBP
View
Price under review
15 more retailers have this diamond
Prices start from £6,350 GBPSave up to £5,274 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
£6,350 GBP