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Round|Natural|GIA

1.28ct F SI1 Round Natural Diamond

EX • F/SI1 • GIA 2567115421

Certificate GIA 2567115421

Diamond specifications and retailer prices

From £3,044 GBP
SGD 5,520 SGD
As of October 31, 2026
Save £2,760 GBP (48%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £5,804 GBP at NZ Jewellers · As of November 2, 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2567115421. Listed at 7 retailers as of October 31, 2026, with prices from £3,044 to £5,804, a £2,760 spread on the same certified stone. NZ Jewellers lists it at £5,804. 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
F
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle33°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2567115421
Dimensions6.98 × 6.99 × 4.29 mm
L/W Ratio1.00
Culet sizeNone
Key to symbols
Feather, Crystal, Needle
Top View
6.98 mm6.99 mm1.28 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2567115421
Side View
Table 56.0%Crown 33°Girdle: MED-STKPavilion 41°Culet: NoneDepth 61.5%

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: Oct 31
Current: £5,804 GBP|Low: £2,818 GBP|High: £5,906 GBP|Avg: £3,834 GBP|-1.7%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 2, 2026
Retailer 5£3,044 GBP
Retailer 6£3,075 GBP
Retailer 2£3,387 GBP
Retailer 3£3,541 GBP
Retailer 7£3,553 GBP
Retailer 4£4,095 GBP
NZ Jewellers£5,804 GBP

44 data points across 7 retailers

7 retailers£3,044 GBP to £5,804 GBP

A
Cheapest Retailer
-
£3,044 GBP
SGD 5,520 SGD
A
Retailer 2
-
£3,075 GBP
$4,126 USD
View
Final sale: no returns
B+
Retailer 3
-
£3,387 GBP
View
B+
Retailer 4
-
£3,541 GBP
€4,526 EUR
View
Retailer 5
-
£3,553 GBP
A$7,336 AUD
View
Price last confirmed 23 days ago
B+
Retailer 6
-
£4,095 GBP
ZAR 88,772 ZAR
View
Most Expensive
B
NZ Jewellers
cfe1ff16-b810-440e-bbac-193280050860 · Nov 2
£5,804 GBP
$7,788 USD
View
6 more retailers have this diamond
Prices start from £3,044 GBPSave up to £2,760 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
£3,044 GBP