CaratHunter
Plans
Round|Lab Grown|IGI

1.09ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG770639320

Shape and cutting style on the report: Round brilliant

Certificate IGI LG770639320

Diamond specifications and retailer prices

From £110 GBP
$148 USD
As of October 29, 2026
Save £657 GBP (86%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £767 GBP at Reve Diamonds · As of October 30, 2026
View at Reve Diamonds

About this 1.09ct lab-grown round diamond

This 1.09ct 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 IGI LG770639320 or 770639320. Listed at 18 retailers as of October 29, 2026, with prices from £110 to £767, a £657 spread on the same certified stone. Reve Diamonds lists it at £767. 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

1.09
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG770639320
Dimensions6.61 × 6.63 × 4.05 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.61 mm6.63 mm1.09 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG770639320
Side View
Table 59.0%Crown 34.3°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 61.2%

Caratlytics Score

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

Price History

Last verified: Oct 29
Current: £268 GBP|Low: £106 GBP|High: £649 GBP|Avg: £300 GBP|+0.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 30, 2026
Retailer 9£110 GBP
Retailer 3£128 GBP
Retailer 11£137 GBP
Retailer 5£237 GBP
Retailer 12£253 GBP
Retailer 6£260 GBP
Retailer 1£268 GBP
Retailer 2£322 GBP
Retailer 10£381 GBP
Retailer 4£441 GBP
Retailer 7£466 GBP
Retailer 8£642 GBP

42 data points across 12 retailers

18 retailers£110 GBP to £767 GBP

A
Cheapest Retailer
-
£110 GBP
$148 USD
A
Retailer 2
-
£123 GBP
$165 USD
View
Final sale: no returns
A
Retailer 3
-
£128 GBP
$172 USD
View
A
Retailer 4
-
£137 GBP
$184 USD
View
A
Retailer 5
-
£137 GBP
$184 USD
View
A
Retailer 6
-
£231 GBP
$309 USD
View
A
Retailer 7
-
£237 GBP
View
B+
Retailer 8
-
£253 GBP
$339 USD
View
B+
Retailer 9
-
£260 GBP
€332 EUR
View
A
Retailer 10
-
£268 GBP
View
B+
Retailer 11
-
£322 GBP
$431 USD
View
B
Retailer 12
-
£352 GBP
$472 USD
View
B+
Retailer 13
-
£381 GBP
$510 USD
View
B
Retailer 14
-
£441 GBP
$591 USD
View
B
Retailer 15
-
£466 GBP
$624 USD
View
B
Retailer 16
-
£482 GBP
$646 USD
View
B
Retailer 17
-
£642 GBP
View
Most Expensive
B
Reve Diamonds
0394E2DC1 · Oct 30
£767 GBP
$1,028 USD
View
17 more retailers have this diamond
Prices start from £110 GBPSave up to £657 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
1.09ct Round
£110 GBP