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Cushion|Lab Grown|IGI

1.80ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG840634358

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG840634358

Diamond specifications and retailer prices

From $719 USD
As of October 30, 2026
Save $3,331 USD (82%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $4,050 USD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.8ct lab-grown cushion diamond

This 1.8ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG840634358 or 840634358. Listed at 19 retailers as of October 30, 2026, with prices from $719 to $4,050, a $3,331 spread on the same certified stone. Brilliant Earth lists it at $4,050. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.80
Carat
D
Color
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle38.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840634358
Dimensions6.94 × 6.87 × 4.58 mm
L/W Ratio1.01
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
6.94 mm6.87 mm1.80 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840634358
Side View
Table 62.0%Crown 36.3°Girdle: MED-THKPavilion 38.1°Culet: NoneDepth 66.7%

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 30
Current: $4,050 USD|Low: $719 USD|High: $5,760 USD|Avg: $2,185 USD|-29.7%
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
Retailer 17
Retailer 18
Retailer 19
November 1, 2026
Retailer 7$719 USD
Retailer 16$777 USD
Retailer 19$845 USD
Retailer 6$956 USD
Retailer 8$1,126 USD
Retailer 13$1,146 USD
Retailer 12$1,255 USD
Retailer 18$1,260 USD
Retailer 3$1,484 USD
Retailer 14$1,650 USD
Retailer 2$2,134 USD
Retailer 4$2,372 USD
Retailer 15$2,498 USD
Retailer 9$2,606 USD
Retailer 17$3,199 USD
Retailer 11$3,469 USD
Retailer 10$3,495 USD
Retailer 5$3,665 USD
Brilliant Earth$4,050 USD

17 data points across 19 retailers

19 retailers$719 USD to $4,050 USD

A
Cheapest Retailer
-
$719 USD
Final sale: no returns
A
Retailer 2
-
$777 USD
£612 GBP
View
A
Retailer 3
-
$845 USD
View
A
Retailer 4
-
$956 USD
View
A
Retailer 5
-
$1,126 USD
View
A
Retailer 6
-
$1,146 USD
£903 GBP
View
A
Retailer 7
-
$1,255 USD
€1,195 EUR
View
A
Retailer 8
-
$1,260 USD
ZAR 20,352 ZAR
View
A
Retailer 9
-
$1,484 USD
View
A
Retailer 10
-
$1,650 USD
View
B+
Retailer 11
-
$2,134 USD
£1,680 GBP
View
B+
Retailer 12
-
$2,372 USD
View
B+
Retailer 13
-
$2,498 USD
View
B+
Retailer 14
-
$2,606 USD
SGD 3,521 SGD
View
B
Retailer 15
-
$3,199 USD
£2,519 GBP
View
B
Retailer 16
-
$3,469 USD
View
Retailer 17
-
$3,495 USD
View
Price last confirmed 10 days ago
B
Retailer 18
-
$3,665 USD
View
Most Expensive
B
Brilliant Earth
22142712A · Oct 31
$4,050 USD
View
18 more retailers have this diamond
Prices start from $719 USDSave up to $3,331 USD

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
1.80ct Cushion
$719 USD