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Cushion|Lab Grown|IGI

1.77ct E IF Cushion Lab Grown Diamond

ID • E/IF • IGI LG671405868

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG671405868

Diamond specifications and retailer prices

From £394 GBP
$525 USD
As of October 29, 2026
Save £3,098 GBP (89%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £3,492 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.77ct lab-grown cushion diamond

This 1.77ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG671405868 or 671405868. Listed at 20 retailers as of October 29, 2026, with prices from £394 to £3,492, a £3,098 spread on the same certified stone. Brilliant Earth lists it at £3,492. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.77
Carat
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle38.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG671405868
Dimensions8.08 × 6.39 × 4.49 mm
L/W Ratio1.26
Girdle conditionFaceted
Culet sizePointed
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
8.08 mm6.39 mm1.77 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG671405868
Side View
Table 61.0%Crown 34.5°Girdle: MED-STKPavilion 38.8°Culet: NoneDepth 70.3%

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 29
Current: £3,492 GBP|Low: £394 GBP|High: £3,492 GBP|Avg: £1,204 GBP
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 30, 2026
Retailer 14£394 GBP
Retailer 8£436 GBP
Retailer 3£608 GBP
Retailer 7£608 GBP
Retailer 4£630 GBP
Retailer 13£661 GBP
Retailer 9£724 GBP
Retailer 16£750 GBP
Retailer 10£1,017 GBP
Retailer 11£1,059 GBP
Retailer 6£1,354 GBP
Retailer 12£1,426 GBP
Retailer 2£1,541 GBP
Retailer 15£1,613 GBP
Retailer 5£2,193 GBP
Brilliant Earth£3,492 GBP

34 data points across 16 retailers

20 retailers£394 GBP to £3,492 GBP

A
Cheapest Retailer
-
£394 GBP
$525 USD
Final sale: no returns
Retailer 2
-
£436 GBP
$581 USD
View
Price last confirmed 17 days ago
Retailer 3
-
£500 GBP
HK$5,200 HKD
View
Price last confirmed 56 days ago
A
Retailer 4
-
£608 GBP
$810 USD
View
A
Retailer 5
-
£608 GBP
$810 USD
View
A
Retailer 6
-
£630 GBP
$839 USD
View
A
Retailer 7
-
£661 GBP
€838 EUR
View
A
Retailer 8
-
£724 GBP
View
A
Retailer 9
-
£750 GBP
ZAR 16,141 ZAR
View
A
Retailer 10
-
£1,017 GBP
A$2,083 AUD
View
A
Retailer 11
-
£1,059 GBP
$1,410 USD
View
B+
Retailer 12
-
£1,354 GBP
$1,803 USD
View
Retailer 13
-
£1,384 GBP
SGD 2,491 SGD
View
Price last confirmed 19 days ago
B+
Retailer 14
-
£1,426 GBP
$1,899 USD
View
B+
Retailer 15
-
£1,482 GBP
$1,974 USD
View
B+
Retailer 16
-
£1,541 GBP
$2,052 USD
View
B+
Retailer 17
-
£1,613 GBP
View
B+
Retailer 18
-
£2,193 GBP
$2,920 USD
View
Retailer 19
-
£2,230 GBP
$2,970 USD
View
Price last confirmed 15 days ago
Most Expensive
B
Brilliant Earth
12605322A · Oct 29
£3,492 GBP
$4,650 USD
View
19 more retailers have this diamond
Prices start from £394 GBPSave up to £3,098 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
1.77ct Cushion
£394 GBP