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Round|Natural|GIA

1.20ct E SI2 Round Natural Diamond

EX • E/SI2 • GIA 6405211720

Certificate GIA 6405211720

Diamond specifications and retailer prices

From £1,559 GBP
As of November 5, 2026
Save £609 GBP (28%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £2,168 GBP at B2C Jewels · As of November 4, 2026
View at B2C Jewels

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded E colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6405211720. Listed at 4 retailers as of November 4, 2026, with prices from £1,559 to £2,168, a £609 spread on the same certified stone. B2C Jewels lists it at £2,168. 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

1.20
Carat
E
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6405211720
Dimensions6.78 × 6.81 × 4.23 mm
L/W Ratio1.00
Star length50%
Top View
6.78 mm6.81 mm1.20 ctE / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6405211720
Side View
Table 56.0%Crown 36.5°Girdle: MED-MEDPavilion 40.6°Culet: NoneDepth 62.3%

Caratlytics Score

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

Last verified: Nov 5
Current: £2,168 GBP|Low: £1,559 GBP|High: £2,477 GBP|Avg: £2,047 GBP|+5.0%
B2C Jewels
Retailer 2
Retailer 3
Retailer 4
November 5, 2026
Retailer 3£1,559 GBP
Retailer 2£1,651 GBP
B2C Jewels£2,168 GBP
Retailer 4£2,477 GBP

43 data points across 4 retailers

4 retailers£1,559 GBP to £2,168 GBP

A
Cheapest Retailer
-
£1,559 GBP
A
Retailer 2
-
£1,651 GBP
View
Final sale: no returns
A
Retailer 3
-
£2,013 GBP
View
Most Expensive
A
B2C Jewels
30815270 · Nov 4
£2,168 GBP
$2,918 USD
View
3 more retailers have this diamond
Prices start from £1,559 GBPSave up to £609 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
1.20ct Round
£1,559 GBP