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Round|Natural|GIA

4.06ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2

Certificate GIA 2

Diamond specifications and retailer prices

From £34,770 GBP
As of November 4, 2026
Save £5,311 GBP (13%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £40,081 GBP at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 4.06ct natural round diamond

This 4.06ct natural round sits in the three to five carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 3 retailers as of November 4, 2026, with prices from £34,770 to £40,081, a £5,311 spread on the same certified stone. Blue Nile lists it at £40,081. 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

4.06
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2
Dimensions10.21 × 10.29 × 6.28 mm
L/W Ratio1.01
Top View
10.21 mm10.29 mm4.06 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2
Side View
Table 59.0%CrownGirdle: Slightly ThickPavilionCulet: NoneDepth 61.2%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £40,081 GBP|Low: £34,770 GBP|High: £40,081 GBP|Avg: £36,688 GBP
Blue Nile
Retailer 2
Retailer 3
September 26, 2026
Retailer 2£34,770 GBP
Retailer 3£36,910 GBP
Blue Nile£40,081 GBP

2 data points across 3 retailers

3 retailers£34,770 GBP to £40,081 GBP

B
Cheapest Retailer
-
£34,770 GBP
B
Retailer 2
-
£36,910 GBP
View
Most Expensive
B
Blue Nile
14125609 · Nov 5
£40,081 GBP
$53,946 USD
View
2 more retailers have this diamond
Prices start from £34,770 GBPSave up to £5,311 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
4.06ct Round
£34,770 GBP