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Cushion|Lab Grown|IGI

3.12ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG653449879

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG653449879

Diamond specifications and retailer prices

From £588 GBP
$788 USD
As of October 30, 2026
Save £2,069 GBP (78%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £2,657 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 3.12ct lab-grown cushion diamond

This 3.12ct lab-grown cushion sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG653449879 or 653449879. Listed at 5 retailers as of October 30, 2026, with prices from £588 to £2,657, a £2,069 spread on the same certified stone. Do Amore Diamonds lists it at £2,657. 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

3.12
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG653449879
Dimensions8.55 × 8.44 × 5.61 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.55 mm8.44 mm3.12 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG653449879
Side View
Table 61.0%Crown 34.5°Girdle: THN-MEDPavilion 40.1°Culet: NoneDepth 66.5%

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: Oct 30
Current: £2,657 GBP|Low: £470 GBP|High: £2,657 GBP|Avg: £1,516 GBP|+3.2%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 29, 2026
Retailer 5£588 GBP
Retailer 3£590 GBP
Retailer 6£790 GBP
Retailer 7£1,047 GBP
Retailer 2£1,512 GBP
Retailer 4£1,515 GBP
Retailer 8£2,321 GBP
Do Amore Diamonds£2,657 GBP

16 data points across 8 retailers

5 retailers£588 GBP to £2,657 GBP

B+
Cheapest Retailer
-
£588 GBP
$788 USD
A
Retailer 2
-
£590 GBP
$790 USD
View
B+
Retailer 3
-
£1,512 GBP
View
B+
Retailer 4
-
£1,515 GBP
$2,030 USD
View
Most Expensive
B
Do Amore Diamonds
27-8CB5ED9B3 · Oct 31
£2,657 GBP
$3,560 USD
View
4 more retailers have this diamond
Prices start from £588 GBPSave up to £2,069 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
3.12ct Cushion
£588 GBP