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Cushion|Lab Grown|IGI

1.28ct D VS1 Cushion Lab Grown Diamond

ID • D/VS1 • IGI LG786634100

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG786634100

Diamond specifications and retailer prices

From $318 USD
As of November 1, 2026
Save $1,778 USD (85%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $2,096 USD at Queensmith · As of October 27, 2026
View at Queensmith

About this 1.28ct lab-grown cushion diamond

This 1.28ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG786634100 or 786634100. Listed at 18 retailers as of October 27, 2026, with prices from $318 to $2,096, a $1,778 spread on the same certified stone. Queensmith lists it at $2,096. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.28
Carat
D
Color
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG786634100
Dimensions7.02 × 6.25 × 3.93 mm
L/W Ratio1.12
Girdle conditionFaceted
Culet sizeLarge
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
7.02 mm6.25 mm1.28 ctD / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG786634100
Side View
Table 52.0%Crown 34.5°Girdle: Slightly ThickPavilion 41.1°Culet: LargeDepth 62.9%

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: Nov 1
Current: $703 USD|Low: $305 USD|High: $1,599 USD|Avg: $796 USD|+3.2%
Retailer 1
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
November 3, 2026
Retailer 11$318 USD
Retailer 5$356 USD
Retailer 4$369 USD
Retailer 2$394 USD
Retailer 13$394 USD
Retailer 12$530 USD
Retailer 9$550 USD
Retailer 1$703 USD
Retailer 8$961 USD
Retailer 10$1,156 USD
Retailer 3$1,262 USD
Retailer 14$1,267 USD
Retailer 6$1,539 USD
Retailer 7$1,580 USD

44 data points across 14 retailers

18 retailers$318 USD to $2,096 USD

A
Cheapest Retailer
-
$318 USD
A
Retailer 2
-
$356 USD
View
Final sale: no returns
A
Retailer 3
-
$369 USD
View
Retailer 4
-
$394 USD
View
Price last confirmed 9 days ago
A
Retailer 5
-
$394 USD
View
A
Retailer 6
-
$530 USD
View
B+
Retailer 7
-
$550 USD
View
B+
Retailer 8
-
$553 USD
View
B+
Retailer 9
-
$703 USD
£554 GBP
View
B
Retailer 10
-
$961 USD
A$1,479 AUD
View
B
Retailer 11
-
$1,156 USD
View
B
Retailer 12
-
$1,262 USD
SGD 1,705 SGD
View
B
Retailer 13
-
$1,267 USD
View
B
Retailer 14
-
$1,312 USD
View
B
Retailer 15
-
$1,539 USD
£1,212 GBP
View
B
Retailer 16
-
$1,570 USD
View
B
Retailer 17
-
$1,580 USD
£1,244 GBP
View
Most Expensive
B
Queensmith
LG786634100 · Oct 27
$2,096 USD
£1,650 GBP
View
17 more retailers have this diamond
Prices start from $318 USDSave up to $1,778 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
1.28ct Cushion
$318 USD