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Cushion|Lab Grown|IGI

2.78ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG830624697

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG830624697

Diamond specifications and retailer prices

From £1,171 GBP
$1,560 USD
As of October 29, 2026
Save £7,179 GBP (86%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £8,350 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 2.78ct lab-grown cushion diamond

This 2.78ct lab-grown cushion sits in the two to three carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG830624697 or 830624697. Listed at 10 retailers as of October 29, 2026, with prices from £1,171 to £8,350, a £7,179 spread on the same certified stone. Brilliant Earth lists it at £8,350. 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

2.78
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.9°
Pavilion angle38.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG830624697
Dimensions9.44 × 7.30 × 5.03 mm
L/W Ratio1.29
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
9.44 mm7.30 mm2.78 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG830624697
Side View
Table 60.0%Crown 33.9°Girdle: MED-THKPavilion 38.8°Culet: NoneDepth 68.9%

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 29
Current: £8,350 GBP|Low: £1,171 GBP|High: £8,643 GBP|Avg: £3,935 GBP|-2.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 6£1,171 GBP
Retailer 4£1,194 GBP
Retailer 9£1,913 GBP
Retailer 3£2,231 GBP
Retailer 7£2,383 GBP
Retailer 5£3,429 GBP
Retailer 8£3,615 GBP
Retailer 10£4,645 GBP
Retailer 2£5,033 GBP
Brilliant Earth£8,350 GBP

32 data points across 10 retailers

10 retailers£1,171 GBP to £8,350 GBP

A
Cheapest Retailer
-
£1,171 GBP
$1,560 USD
A
Retailer 2
-
£1,194 GBP
$1,590 USD
View
A
Retailer 3
-
£1,913 GBP
$2,548 USD
View
A
Retailer 4
-
£2,231 GBP
€2,829 EUR
View
A
Retailer 5
-
£2,383 GBP
$3,174 USD
View
B+
Retailer 6
-
£3,429 GBP
View
B+
Retailer 7
-
£3,615 GBP
$4,814 USD
View
Retailer 8
-
£4,645 GBP
$6,185 USD
View
Price last confirmed 8 days ago
B+
Retailer 9
-
£5,033 GBP
$6,702 USD
View
Most Expensive
B
Brilliant Earth
21286525A · Oct 29
£8,350 GBP
$11,120 USD
View
9 more retailers have this diamond
Prices start from £1,171 GBPSave up to £7,179 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
2.78ct Cushion
£1,171 GBP