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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 $498 USD
As of October 30, 2026
Save $3,322 USD (87%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $3,820 USD 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 $498 to $3,820, a $3,322 spread on the same certified stone. Brilliant Earth lists it at $3,820. 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
Color
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

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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: $3,820 USD|Low: $356 USD|High: $5,630 USD|Avg: $1,967 USD|-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 30, 2026
Retailer 5$498 USD
Retailer 8$670 USD
Retailer 13$725 USD
Retailer 10$795 USD
Retailer 6$873 USD
Retailer 3$1,232 USD
Retailer 2$1,292 USD
Retailer 11$1,481 USD
Retailer 7$2,049 USD
Retailer 4$3,275 USD
Retailer 12$3,275 USD
Retailer 9$3,600 USD
Brilliant Earth$3,820 USD

33 data points across 13 retailers

13 retailers$498 USD to $3,820 USD

A
Cheapest Retailer
-
$498 USD
Final sale: no returns
A
Retailer 2
-
$670 USD
View
A
Retailer 3
-
$725 USD
View
A
Retailer 4
-
$795 USD
View
A
Retailer 5
-
$873 USD
€831 EUR
View
A
Retailer 6
-
$1,232 USD
View
A
Retailer 7
-
$1,292 USD
A$1,987 AUD
View
A
Retailer 8
-
$1,481 USD
View
B+
Retailer 9
-
$2,049 USD
£1,613 GBP
View
Retailer 10
-
$3,275 USD
A$5,038 AUD
View
Price last confirmed 21 days ago
Retailer 11
-
$3,275 USD
View
Price last confirmed 9 days ago
B
Retailer 12
-
$3,600 USD
View
Most Expensive
B
Brilliant Earth
14895653Y · Oct 30
$3,820 USD
View
12 more retailers have this diamond
Prices start from $498 USDSave up to $3,322 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
1.89ct Cushion
$498 USD