Cushion|Lab Grown|IGI

1.00ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG818640099

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG818640099

Diamond specifications and retailer prices

From £475 GBP
$637 USD
As of October 30, 2026
Save £1,473 GBP (76%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,948 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1ct lab-grown cushion diamond

This 1ct lab-grown cushion sits in the classic one-carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG818640099 or 818640099. Listed at 16 retailers as of October 29, 2026, with prices from £475 to £1,948, a £1,473 spread on the same certified stone. Brilliant Earth lists it at £1,948. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.00
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.8°
Pavilion angle41.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818640099
Dimensions6.98 × 5.35 × 3.55 mm
L/W Ratio1.30
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
6.98 mm5.35 mm1.00 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818640099
Side View
Table 62.0%Crown 33.8°Girdle: THN-STKPavilion 41.4°Culet: NoneDepth 66.4%

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: £1,948 GBP|Low: £286 GBP|High: £2,008 GBP|Avg: £951 GBP|-3.0%
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
Retailer 16
October 31, 2026
Retailer 16£402 GBP
Retailer 15£475 GBP
Retailer 14£487 GBP
Retailer 13£549 GBP
Retailer 7£597 GBP
Retailer 5£605 GBP
Retailer 2£668 GBP
Retailer 10£740 GBP
Retailer 12£766 GBP
Retailer 8£967 GBP
Retailer 9£975 GBP
Retailer 6£1,175 GBP
Retailer 4£1,453 GBP
Retailer 3£1,561 GBP
Retailer 11£1,870 GBP
Brilliant Earth£1,948 GBP

38 data points across 16 retailers

16 retailers£475 GBP to £1,948 GBP

Retailer 1
-
£402 GBP
$539 USD
Price last confirmed 12 days ago
Final sale: no returns
A
Retailer 2
-
£475 GBP
$637 USD
View
A
Retailer 3
-
£487 GBP
HK$5,100 HKD
View
A
Retailer 4
-
£549 GBP
$735 USD
View
A
Retailer 5
-
£597 GBP
$800 USD
View
A
Retailer 6
-
£605 GBP
$811 USD
View
B+
Retailer 7
-
£668 GBP
€853 EUR
View
B+
Retailer 8
-
£740 GBP
View
B+
Retailer 9
-
£766 GBP
ZAR 16,574 ZAR
View
Retailer 10
-
£967 GBP
$1,296 USD
View
Price last confirmed 52 days ago
B+
Retailer 11
-
£975 GBP
$1,306 USD
View
B
Retailer 12
-
£1,175 GBP
SGD 2,128 SGD
View
B
Retailer 13
-
£1,453 GBP
$1,947 USD
View
B
Retailer 14
-
£1,561 GBP
$2,092 USD
View
B
Retailer 15
-
£1,870 GBP
View
Most Expensive
B
Brilliant Earth
21086551A · Oct 29
£1,948 GBP
$2,610 USD
View
15 more retailers have this diamond
Prices start from £475 GBPSave up to £1,473 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
1.00ct Cushion
£475 GBP