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Round|Natural|GIA

3.09ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 05

Certificate GIA 05

Diamond specifications and retailer prices

From £18,986 GBP
As of November 4, 2026
Save £1,655 GBP (8%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £20,641 GBP at B2C Jewels · As of November 4, 2026
View at B2C Jewels

About this 3.09ct natural round diamond

This 3.09ct 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 2 retailers as of November 4, 2026, with a relatively tight 9% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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

3.09
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 05
Dimensions9.26 × 9.34 mm
L/W Ratio1.01
Top View
9.26 mm9.34 mm3.09 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 05
Side View
Table 58.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 62.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 4
Current: £20,641 GBP|Low: £18,986 GBP|High: £20,641 GBP|Avg: £19,601 GBP|+1.2%
B2C Jewels
Retailer 2
September 23, 2026
Retailer 2£18,986 GBP
B2C Jewels£20,641 GBP

3 data points across 2 retailers

2 retailers£18,986 GBP to £20,641 GBP

B+
Cheapest Retailer
-
£18,986 GBP
Most Expensive
B
B2C Jewels
23768522 · Nov 4
£20,641 GBP
$27,781 USD
View
1 more retailer has this diamond
Prices start from £18,986 GBPSave up to £1,655 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+
3.09ct Round
£18,986 GBP