CaratHunter
Plans
Cushion|Lab Grown|IGI

1.00ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG830650343

Shape and cutting style on the report: Cushion antique cut

Certificate IGI LG830650343

Diamond specifications and retailer prices

From £137 GBP
$184 USD
As of October 29, 2026
Save £716 GBP (84%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £853 GBP at Reve Diamonds · As of October 30, 2026
View at Reve Diamonds

About this 1ct lab-grown cushion diamond

This 1ct lab-grown cushion 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 LG830650343 or 830650343. Listed at 16 retailers as of October 29, 2026, with prices from £137 to £853, a £716 spread on the same certified stone. Reve Diamonds lists it at £853. 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

1.00
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.9°
Pavilion angle40°
OriginLab Grown
Grading LabIGI
CertificateIGI LG830650343
Dimensions7.52 × 5.25 × 3.21 mm
L/W Ratio1.43
Girdle conditionFaceted
Culet sizeLarge
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.52 mm5.25 mm1.00 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG830650343
Side View
Table 62.0%Crown 37.9°Girdle: MED-STKPavilion 40°Culet: LargeDepth 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: £308 GBP|Low: £109 GBP|High: £853 GBP|Avg: £376 GBP|+4.7%
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
Retailer 14
Reve Diamonds
October 31, 2026
Retailer 10£137 GBP
Retailer 5£154 GBP
Retailer 4£160 GBP
Retailer 2£171 GBP
Retailer 12£171 GBP
Retailer 6£224 GBP
Retailer 7£284 GBP
Retailer 3£300 GBP
Retailer 1£308 GBP
Retailer 14£377 GBP
Retailer 11£549 GBP
Retailer 9£579 GBP
Retailer 13£589 GBP
Retailer 8£799 GBP
Reve Diamonds£853 GBP

44 data points across 15 retailers

16 retailers£137 GBP to £853 GBP

A
Cheapest Retailer
-
£137 GBP
$184 USD
A
Retailer 2
-
£154 GBP
$206 USD
View
Final sale: no returns
A
Retailer 3
-
£160 GBP
$214 USD
View
A
Retailer 4
-
£171 GBP
$229 USD
View
A
Retailer 5
-
£171 GBP
$229 USD
View
A
Retailer 6
-
£224 GBP
$300 USD
View
A
Retailer 7
-
£284 GBP
€362 EUR
View
B+
Retailer 8
-
£300 GBP
$402 USD
View
B+
Retailer 9
-
£308 GBP
View
B+
Retailer 10
-
£377 GBP
A$778 AUD
View
B
Retailer 11
-
£463 GBP
SGD 838 SGD
View
B
Retailer 12
-
£549 GBP
$735 USD
View
B
Retailer 13
-
£579 GBP
$776 USD
View
B
Retailer 14
-
£589 GBP
$789 USD
View
B
Retailer 15
-
£799 GBP
View
Most Expensive
B
Reve Diamonds
0D8A5DAB5 · Oct 30
£853 GBP
$1,144 USD
View
15 more retailers have this diamond
Prices start from £137 GBPSave up to £716 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
1.00ct Cushion
£137 GBP