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Round|Natural|GIA

1.55ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6531188321

Certificate GIA 6531188321

Diamond specifications and retailer prices

From £5,414 GBP
As of November 6, 2026
Save £6,800 GBP (56%) vs most expensive(unlock to see where)
28 retailers carry this diamond
Most expensive: £12,215 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6531188321. Listed at 28 retailers as of November 5, 2026, with prices from £5,414 to £12,215, a £6,800 spread on the same certified stone. NZ Jewellers lists it at £12,215. 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 angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6531188321
Dimensions7.36 × 7.34 × 4.56 mm
L/W Ratio1.00
Top View
7.36 mm7.34 mm1.55 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6531188321
Side View
Table 58.0%Crown 36°Girdle: Slightly ThickPavilion 40.6°Culet: NoneDepth 62.1%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £6,707 GBP|Low: £5,414 GBP|High: £10,300 GBP|Avg: £7,385 GBP|-0.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 9£5,414 GBP
Retailer 6£5,585 GBP
Retailer 4£5,718 GBP
Retailer 8£5,860 GBP
Retailer 1£6,707 GBP
Retailer 7£6,747 GBP
Retailer 3£7,525 GBP
Retailer 2£8,909 GBP
Retailer 5£10,150 GBP

44 data points across 9 retailers

28 retailers£5,414 GBP to £12,215 GBP

B+
Cheapest Retailer
-
£5,414 GBP
B+
Retailer 2
-
£5,538 GBP
View
B+
Retailer 3
-
£5,585 GBP
View
B+
Retailer 4
-
£5,705 GBP
View
B+
Retailer 5
-
£5,718 GBP
View
B+
Retailer 6
-
£5,860 GBP
View
Final sale: no returns
B+
Retailer 7
-
£5,882 GBP
View
B+
Retailer 8
-
£6,002 GBP
View
B+
Retailer 9
-
£6,078 GBP
View
Retailer 10
-
£6,107 GBP
View
Price last confirmed 8 days ago
B
Retailer 11
-
£6,509 GBP
View
B
Retailer 12
-
£6,616 GBP
View
B+
Retailer 13
-
£6,707 GBP
View
B
Retailer 14
-
£6,718 GBP
View
Retailer 15
-
£6,747 GBP
View
Price last confirmed 14 days ago
B
Retailer 16
-
£6,778 GBP
View
B
Retailer 17
-
£7,020 GBP
View
B
Retailer 18
-
£7,239 GBP
View
B
Retailer 19
-
£7,239 GBP
View
B
Retailer 20
-
£7,402 GBP
View
B
Retailer 21
-
£7,479 GBP
View
B
Retailer 22
-
£7,525 GBP
View
B
Retailer 23
-
£7,634 GBP
View
B
Retailer 24
-
£7,795 GBP
View
Retailer 25
-
£8,040 GBP
View
Price last confirmed 14 days ago
B
Retailer 26
-
£8,909 GBP
View
B
Retailer 27
-
£10,150 GBP
View
Most Expensive
B
NZ Jewellers
bad8d0d6-c1c9-4c6b-977e-f24c51c588e1 · Nov 5
£12,215 GBP
$16,349 USD
View
27 more retailers have this diamond
Prices start from £5,414 GBPSave up to £6,800 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
£5,414 GBP