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Round|Natural|GIA

1.28ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 3555600029

Certificate GIA 3555600029

Diamond specifications and retailer prices

From £1,987 GBP
As of November 6, 2026
Save £2,657 GBP (57%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £4,643 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.28ct natural round diamond

This 1.28ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 3555600029. Listed at 21 retailers as of November 5, 2026, with prices from £1,987 to £4,643, a £2,657 spread on the same certified stone. NZ Jewellers lists it at £4,643. 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

1.28
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 3555600029
Dimensions6.94 × 6.97 × 4.27 mm
L/W Ratio1.00
Culet sizeNone
Key to symbols
Twinning Wisp, Cloud, Crystal, Feather, Needle, Indented Natural
Top View
6.94 mm6.97 mm1.28 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 3555600029
Side View
Table 58.0%Crown 35°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.4%

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 6
Current: £1,987 GBP|Low: £1,987 GBP|High: £4,504 GBP|Avg: £2,862 GBP|-2.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 1£1,987 GBP
Retailer 7£1,989 GBP
Retailer 9£2,290 GBP
Retailer 2£2,550 GBP
Retailer 3£2,741 GBP
Retailer 8£2,843 GBP
Retailer 4£3,096 GBP
Retailer 5£3,253 GBP
Retailer 6£4,445 GBP

26 data points across 9 retailers

21 retailers£1,987 GBP to £4,643 GBP

A
Cheapest Retailer
-
£1,987 GBP
A
Retailer 2
-
£1,989 GBP
View
A
Retailer 3
-
£2,290 GBP
View
A
Retailer 4
-
£2,366 GBP
View
A
Retailer 5
-
£2,459 GBP
View
Final sale: no returns
A
Retailer 6
-
£2,550 GBP
View
A
Retailer 7
-
£2,563 GBP
View
Retailer 8
-
£2,665 GBP
View
Price last confirmed 8 days ago
B+
Retailer 9
-
£2,665 GBP
View
A
Retailer 10
-
£2,741 GBP
View
B+
Retailer 11
-
£2,767 GBP
View
B+
Retailer 12
-
£2,767 GBP
View
B+
Retailer 13
-
£2,773 GBP
View
B+
Retailer 14
-
£2,843 GBP
View
Retailer 15
-
£2,854 GBP
View
Price last confirmed 29 days ago
B+
Retailer 16
-
£3,075 GBP
View
B+
Retailer 17
-
£3,096 GBP
View
B+
Retailer 18
-
£3,253 GBP
View
B
Retailer 19
-
£4,445 GBP
View
Retailer 20
-
£4,526 GBP
View
Price last confirmed 66 days ago
Most Expensive
B
NZ Jewellers
3a3018ef-e528-4962-97d6-8518516e0f75 · Nov 5
£4,643 GBP
$6,215 USD
View
20 more retailers have this diamond
Prices start from £1,987 GBPSave up to £2,657 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
1.28ct Round
£1,987 GBP