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Cushion|Lab Grown|IGI

3.06ct F VS1 Cushion Lab Grown Diamond

ID • F/VS1 • IGI LG818686311

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG818686311

Diamond specifications and retailer prices

From £638 GBP
$855 USD
As of October 31, 2026
Save £2,870 GBP (82%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £3,508 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 3.06ct lab-grown cushion diamond

This 3.06ct lab-grown cushion sits in the three to five carat band, graded F colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG818686311 or 818686311. Listed at 18 retailers as of October 31, 2026, with prices from £638 to £3,508, a £2,870 spread on the same certified stone. Brilliant Earth lists it at £3,508. 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

3.06
Carat
F
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle45.5°
Pavilion angle41.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818686311
Dimensions9.86 × 7.40 × 4.96 mm
L/W Ratio1.33
Girdle conditionFaceted
Culet sizeLarge
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.86 mm7.40 mm3.06 ctF / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818686311
Side View
Table 60.0%Crown 45.5°Girdle: STK-THKPavilion 41.3°Culet: LargeDepth 67.0%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 31
Current: £3,508 GBP|Low: £539 GBP|High: £4,396 GBP|Avg: £1,310 GBP|-20.2%
Brilliant Earth
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
Retailer 15
November 1, 2026
Retailer 4£539 GBP
Retailer 13£638 GBP
Retailer 14£722 GBP
Retailer 8£809 GBP
Retailer 2£835 GBP
Retailer 5£937 GBP
Retailer 10£1,138 GBP
Retailer 12£1,218 GBP
Retailer 3£1,570 GBP
Retailer 15£1,612 GBP
Retailer 6£1,702 GBP
Retailer 9£1,720 GBP
Retailer 7£1,745 GBP
Retailer 11£2,342 GBP
Brilliant Earth£3,508 GBP

41 data points across 15 retailers

18 retailers£638 GBP to £3,508 GBP

Retailer 1
-
£434 GBP
$582 USD
Price last confirmed 33 days ago
Retailer 2
-
£487 GBP
$652 USD
View
Price last confirmed 38 days ago
Retailer 3
-
£532 GBP
$713 USD
View
Price last confirmed 33 days ago
A
Retailer 4
-
£638 GBP
$855 USD
View
A
Retailer 5
-
£722 GBP
$968 USD
View
A
Retailer 6
-
£809 GBP
€1,032 EUR
View
A
Retailer 7
-
£835 GBP
View
A
Retailer 8
-
£937 GBP
$1,256 USD
View
B+
Retailer 9
-
£1,138 GBP
A$2,346 AUD
View
B+
Retailer 10
-
£1,218 GBP
$1,632 USD
View
Retailer 11
-
£1,417 GBP
$1,899 USD
View
Price last confirmed 32 days ago
Retailer 12
-
£1,570 GBP
View
Price last confirmed 16 days ago
Retailer 13
-
£1,612 GBP
A$3,322 AUD
View
Price last confirmed 29 days ago
B+
Retailer 14
-
£1,702 GBP
SGD 3,081 SGD
View
B+
Retailer 15
-
£1,720 GBP
$2,305 USD
View
B+
Retailer 16
-
£1,745 GBP
$2,338 USD
View
B
Retailer 17
-
£2,342 GBP
View
Most Expensive
B
Brilliant Earth
21728218A · Oct 31
£3,508 GBP
$4,700 USD
View
17 more retailers have this diamond
Prices start from £638 GBPSave up to £2,870 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
3.06ct Cushion
£638 GBP