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Round|Lab Grown|GIA

1.21ct E SI1 Round Lab Grown Diamond

EX • E/SI1 • GIA 2497979319

Shape and cutting style on the report: Round

Certificate GIA 2497979319

Diamond specifications and retailer prices

From £296 GBP
As of November 5, 2026
Save £513 GBP (63%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £810 GBP at Brilliant Earth · As of November 5, 2026
View at Brilliant Earth

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2497979319. Listed at 6 retailers as of November 5, 2026, with prices from £296 to £810, a £513 spread on the same certified stone. Brilliant Earth lists it at £810. 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

1.21
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle41.4°
OriginLab Grown
Grading LabGIA
CertificateGIA 2497979319
Dimensions6.86 × 6.89 × 4.22 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Top View
6.86 mm6.89 mm1.21 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2497979319
Side View
Table 59.0%Crown 34°Girdle: MediumPavilion 41.4°Culet: NoneDepth 61.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £810 GBP|Low: £291 GBP|High: £1,476 GBP|Avg: £769 GBP|-4.4%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 8£296 GBP
Retailer 7£447 GBP
Retailer 6£488 GBP
Retailer 2£547 GBP
Retailer 5£574 GBP
Retailer 3£780 GBP
Retailer 11£780 GBP
Brilliant Earth£810 GBP
Retailer 4£824 GBP
Retailer 10£981 GBP
Retailer 9£1,249 GBP
Retailer 12£1,476 GBP

24 data points across 12 retailers

6 retailers£296 GBP to £810 GBP

A
Cheapest Retailer
-
£296 GBP
B+
Retailer 2
-
£447 GBP
View
B
Retailer 3
-
£488 GBP
View
B
Retailer 4
-
£547 GBP
View
B
Retailer 5
-
£574 GBP
View
Most Expensive
B
Brilliant Earth
11210145A · Nov 5
£810 GBP
$1,090 USD
View
5 more retailers have this diamond
Prices start from £296 GBPSave up to £513 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
1.21ct Round
£296 GBP