CaratHunter
Plans
Round|Lab Grown|IGI

1.09ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG803603992

Shape and cutting style on the report: Round brilliant

Certificate IGI LG803603992

Diamond specifications and retailer prices

From £111 GBP
$149 USD
As of October 29, 2026
Save £666 GBP (86%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £777 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 LG803603992 or 803603992. Listed at 17 retailers as of October 29, 2026, with prices from £111 to £777, a £666 spread on the same certified stone. Reve Diamonds lists it at £777. 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 angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG803603992
Dimensions6.65 × 6.62 × 4.05 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.65 mm6.62 mm1.09 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG803603992
Side View
Table 57.0%Crown 34.3°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.1%

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: £452 GBP|Low: £125 GBP|High: £777 GBP|Avg: £313 GBP
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Reve Diamonds
October 31, 2026
Retailer 8£131 GBP
Retailer 9£140 GBP
Retailer 7£231 GBP
Retailer 3£239 GBP
Retailer 12£245 GBP
Retailer 10£258 GBP
Retailer 11£275 GBP
Retailer 4£343 GBP
Retailer 6£371 GBP
Retailer 5£381 GBP
Retailer 1£452 GBP
Retailer 13£494 GBP
Retailer 2£648 GBP
Reve Diamonds£777 GBP

36 data points across 14 retailers

17 retailers£111 GBP to £777 GBP

A
Cheapest Retailer
-
£111 GBP
$149 USD
A
Retailer 2
-
£131 GBP
$176 USD
View
A
Retailer 3
-
£138 GBP
$185 USD
View
A
Retailer 4
-
£138 GBP
$185 USD
View
A
Retailer 5
-
£140 GBP
$187 USD
View
Final sale: no returns
A
Retailer 6
-
£231 GBP
$310 USD
View
A
Retailer 7
-
£239 GBP
€305 EUR
View
A
Retailer 8
-
£245 GBP
View
B+
Retailer 9
-
£258 GBP
$346 USD
View
B+
Retailer 10
-
£275 GBP
View
B+
Retailer 11
-
£343 GBP
A$708 AUD
View
B
Retailer 12
-
£371 GBP
$497 USD
View
Retailer 13
-
£381 GBP
$510 USD
View
Price last confirmed 14 days ago
B
Retailer 14
-
£452 GBP
$606 USD
View
B
Retailer 15
-
£494 GBP
$662 USD
View
B
Retailer 16
-
£648 GBP
View
Most Expensive
B
Reve Diamonds
FDA9E6D5D · Oct 30
£777 GBP
$1,041 USD
View
16 more retailers have this diamond
Prices start from £111 GBPSave up to £666 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
£111 GBP