CaratHunter
Plans
Cushion|Lab Grown|IGI

1.15ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG653439405

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG653439405

Diamond specifications and retailer prices

From £179 GBP
As of November 6, 2026
Save £1,061 GBP (86%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £1,539 GBP at Do Amore Diamonds · As of November 6, 2026
View at Do Amore Diamonds

About this 1.15ct lab-grown cushion diamond

This 1.15ct lab-grown cushion sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG653439405 or 653439405. Listed at 10 retailers as of November 6, 2026, with a 592% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.15
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.1°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG653439405
Dimensions6.22 × 6.10 × 4.01 mm
L/W Ratio1.02
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.22 mm6.10 mm1.15 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG653439405
Side View
Table 62.0%Crown 31.1°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 65.7%

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: Nov 6
Current: £1,539 GBP|Low: £94 GBP|High: £1,539 GBP|Avg: £541 GBP
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 9£179 GBP
Retailer 7£199 GBP
Retailer 11£227 GBP
Retailer 5£249 GBP
Retailer 12£267 GBP
Retailer 8£407 GBP
Retailer 2£409 GBP
Retailer 4£433 GBP
Retailer 13£501 GBP
Retailer 3£796 GBP
Retailer 10£832 GBP
Retailer 6£877 GBP
Do Amore Diamonds£1,539 GBP

42 data points across 13 retailers

10 retailers£179 GBP to £1,240 GBP

A
Cheapest Retailer
-
£179 GBP
Final sale: no returns
Retailer 2
-
£199 GBP
View
Price last confirmed 22 days ago
A
Retailer 3
-
£227 GBP
View
A
Retailer 4
-
£267 GBP
View
B+
Retailer 5
-
£407 GBP
View
B+
Retailer 6
-
£409 GBP
View
B
Retailer 7
-
£832 GBP
View
B
Retailer 8
-
£877 GBP
View
B
Retailer 9
-
£1,240 GBP
View
Most Expensive
Do Amore Diamonds
27-FFC2DA70E · Nov 6
£1,539 GBP
$2,060 USD
View
Price under review
9 more retailers have this diamond
Prices start from £179 GBPSave up to £1,061 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
1.15ct Cushion
£179 GBP