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Round|Natural|IGI

1.28ct I IF Round Natural Diamond

EX • I/IF • IGI 821678901

Certificate IGI 821678901

Diamond specifications and retailer prices

From £3,263 GBP
As of November 5, 2026
Save £268 GBP (8%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £3,531 GBP at 77 Diamonds · As of November 5, 2026
View at 77 Diamonds

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 IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI 821678901. Listed at 2 retailers as of November 5, 2026, with a relatively tight 8% spread, which is unusual at this carat range and suggests competitive pricing across the listings. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.28
Carat
I
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabIGI
CertificateIGI 821678901
Dimensions6.94 × 7.01 × 4.24 mm
L/W Ratio1.01
Top View
6.94 mm7.01 mm1.28 ctI / IF
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 821678901
Side View
Table 61.0%CrownGirdlePavilionCuletDepth 60.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 5
Current: £3,531 GBP|Low: £3,263 GBP|High: £3,897 GBP|Avg: £3,680 GBP|-8.1%
77 Diamonds
Retailer 2
November 5, 2026
Retailer 2£3,263 GBP
77 Diamonds£3,531 GBP

35 data points across 2 retailers

2 retailers£3,263 GBP to £3,531 GBP

A
Cheapest Retailer
-
£3,263 GBP
Most Expensive
A
77 Diamonds
RBCPGNKSZWEA · Nov 5
£3,531 GBP
View
1 more retailer has this diamond
Prices start from £3,263 GBPSave up to £268 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
£3,263 GBP