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Cushion|Lab Grown|IGI

5.18ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG846662161

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG846662161

Diamond specifications and retailer prices

From £5,182 GBP
$6,943 USD
As of October 30, 2026
Save £7,879 GBP (60%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £13,061 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 5.18ct lab-grown cushion diamond

This 5.18ct lab-grown cushion sits in the over five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG846662161 or 846662161. Listed at 10 retailers as of October 30, 2026, with prices from £5,182 to £13,061, a £7,879 spread on the same certified stone. Brilliant Earth lists it at £13,061. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

5.18
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle36.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG846662161
Dimensions12.69 × 8.97 × 5.95 mm
L/W Ratio1.41
Girdle conditionFaceted
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
12.69 mm8.97 mm5.18 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG846662161
Side View
Table 63.0%Crown 34.1°Girdle: MED-THKPavilion 36.4°Culet: NoneDepth 66.3%

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 30
Current: £13,061 GBP|Low: £5,182 GBP|High: £39,524 GBP|Avg: £12,879 GBP|-38.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 5£5,182 GBP
Retailer 2£5,833 GBP
Retailer 7£6,047 GBP
Retailer 10£7,028 GBP
Retailer 4£7,974 GBP
Retailer 9£12,356 GBP
Retailer 6£12,709 GBP
Retailer 8£12,730 GBP
Brilliant Earth£13,061 GBP
Retailer 3£37,816 GBP

10 data points across 10 retailers

10 retailers£5,182 GBP to £13,061 GBP

A
Cheapest Retailer
-
£5,182 GBP
$6,943 USD
A
Retailer 2
-
£5,833 GBP
$7,815 USD
View
A
Retailer 3
-
£6,047 GBP
View
A
Retailer 4
-
£7,028 GBP
$9,417 USD
View
A
Retailer 5
-
£7,974 GBP
$10,684 USD
View
B+
Retailer 6
-
£12,356 GBP
View
B+
Retailer 7
-
£12,709 GBP
$17,028 USD
View
B+
Retailer 8
-
£12,730 GBP
€16,245 EUR
View
Most Expensive
B+
Brilliant Earth
22254736A · Oct 30
£13,061 GBP
$17,500 USD
View
8 more retailers have this diamond
Prices start from £5,182 GBPSave up to £7,879 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
5.18ct Cushion
£5,182 GBP