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Cushion|Lab Grown|IGI

1.65ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG485151098

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG485151098

Diamond specifications and retailer prices

From £156 GBP
$208 USD
As of October 28, 2026
Save £1,180 GBP (88%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,337 GBP at Do Amore Diamonds · As of October 29, 2026
View at Do Amore Diamonds

About this 1.65ct lab-grown cushion diamond

This 1.65ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG485151098 or 485151098. Listed at 14 retailers as of October 28, 2026, with prices from £156 to £1,337, a £1,180 spread on the same certified stone. Do Amore Diamonds lists it at £1,337. 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

1.65
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG485151098
Dimensions7.48 × 6.52 × 4.41 mm
L/W Ratio1.15
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
7.48 mm6.52 mm1.65 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG485151098
Side View
Table 62.5%Crown 35.4°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 67.6%

Caratlytics Score

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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 28
Current: £351 GBP|Low: £156 GBP|High: £1,449 GBP|Avg: £500 GBP|+4.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 9£156 GBP
Retailer 7£173 GBP
Retailer 2£233 GBP
Retailer 3£312 GBP
Retailer 1£351 GBP
Retailer 10£427 GBP
Retailer 5£650 GBP
Retailer 8£707 GBP
Retailer 4£893 GBP
Retailer 6£916 GBP

42 data points across 10 retailers

14 retailers£156 GBP to £1,337 GBP

A
Cheapest Retailer
-
£156 GBP
$208 USD
Final sale: no returns
A
Retailer 2
-
£173 GBP
$230 USD
View
B+
Retailer 3
-
£233 GBP
$310 USD
View
A
Retailer 4
-
£312 GBP
€396 EUR
View
A
Retailer 5
-
£317 GBP
$422 USD
View
A
Retailer 6
-
£351 GBP
View
A
Retailer 7
-
£427 GBP
$569 USD
View
B+
Retailer 8
-
£643 GBP
$856 USD
View
Retailer 9
-
£650 GBP
$865 USD
View
Price last confirmed 8 days ago
Retailer 10
-
£687 GBP
$915 USD
View
Price last confirmed 109 days ago
B+
Retailer 11
-
£707 GBP
$942 USD
View
B
Retailer 12
-
£893 GBP
View
B
Retailer 13
-
£916 GBP
$1,220 USD
View
Most Expensive
B
Do Amore Diamonds
27-D3AE044AA · Oct 29
£1,337 GBP
$1,780 USD
View
13 more retailers have this diamond
Prices start from £156 GBPSave up to £1,180 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
1.65ct Cushion
£156 GBP