CaratHunter
Plans
Cushion|Lab Grown|IGI

1.89ct D IF Cushion Lab Grown Diamond

ID • D/IF • IGI LG718507117

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG718507117

Diamond specifications and retailer prices

From £372 GBP
$498 USD
As of October 30, 2026
Save £2,479 GBP (87%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £2,851 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 1.89ct lab-grown cushion diamond

This 1.89ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG718507117 or 718507117. Listed at 13 retailers as of October 30, 2026, with prices from £372 to £2,851, a £2,479 spread on the same certified stone. Brilliant Earth lists it at £2,851. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.89
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle42.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG718507117
Dimensions8.33 × 6.50 × 4.57 mm
L/W Ratio1.28
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
8.33 mm6.50 mm1.89 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG718507117
Side View
Table 58.0%Crown 34°Girdle: STK-THKPavilion 42.1°Culet: NoneDepth 70.3%

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 30
Current: £2,851 GBP|Low: £372 GBP|High: £4,202 GBP|Avg: £1,466 GBP|-32.1%
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
October 31, 2026
Retailer 5£372 GBP
Retailer 9£500 GBP
Retailer 3£541 GBP
Retailer 11£593 GBP
Retailer 2£647 GBP
Retailer 4£919 GBP
Retailer 7£964 GBP
Retailer 12£1,106 GBP
Retailer 8£1,529 GBP
Retailer 6£2,412 GBP
Retailer 13£2,444 GBP
Retailer 10£2,687 GBP
Brilliant Earth£2,851 GBP

33 data points across 13 retailers

13 retailers£372 GBP to £2,851 GBP

A
Cheapest Retailer
-
£372 GBP
$498 USD
Final sale: no returns
A
Retailer 2
-
£500 GBP
$670 USD
View
A
Retailer 3
-
£541 GBP
$725 USD
View
A
Retailer 4
-
£593 GBP
$795 USD
View
A
Retailer 5
-
£647 GBP
€825 EUR
View
A
Retailer 6
-
£919 GBP
$1,232 USD
View
A
Retailer 7
-
£964 GBP
A$1,987 AUD
View
A
Retailer 8
-
£1,106 GBP
$1,481 USD
View
B+
Retailer 9
-
£1,529 GBP
View
B+
Retailer 10
-
£2,412 GBP
A$4,972 AUD
View
Retailer 11
-
£2,444 GBP
$3,275 USD
View
Price last confirmed 10 days ago
B
Retailer 12
-
£2,687 GBP
$3,600 USD
View
Most Expensive
B
Brilliant Earth
14895653Y · Oct 30
£2,851 GBP
$3,820 USD
View
12 more retailers have this diamond
Prices start from £372 GBPSave up to £2,479 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
1.89ct Cushion
£372 GBP