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Cushion|Lab Grown|IGI

1.70ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG490177399

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG490177399

Diamond specifications and retailer prices

From $250 USD
As of October 31, 2026
Save $1,870 USD (88%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $2,120 USD at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 1.7ct lab-grown cushion diamond

This 1.7ct lab-grown cushion sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG490177399 or 490177399. Listed at 6 retailers as of October 31, 2026, with prices from $250 to $2,120, a $1,870 spread on the same certified stone. Do Amore Diamonds lists it at $2,120. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.70
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle42.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG490177399
Dimensions6.98 × 6.94 × 4.79 mm
L/W Ratio1.01
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
6.98 mm6.94 mm1.70 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG490177399
Side View
Table 63.0%Crown 35.4°Girdle: THN-THKPavilion 42.9°Culet: NoneDepth 69.0%

Caratlytics Score

How it works →
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 31
Current: $2,120 USD|Low: $156 USD|High: $2,140 USD|Avg: $909 USD|+7.1%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 29, 2026
Retailer 6$250 USD
Retailer 3$468 USD
Retailer 9$517 USD
Retailer 8$587 USD
Retailer 7$661 USD
Retailer 4$915 USD
Retailer 2$1,217 USD
Retailer 5$1,450 USD
Do Amore Diamonds$2,120 USD

14 data points across 9 retailers

6 retailers$250 USD to $2,120 USD

A
Cheapest Retailer
-
$250 USD
Final sale: no returns
B+
Retailer 2
-
$468 USD
View
B+
Retailer 3
-
$915 USD
View
B
Retailer 4
-
$1,217 USD
£958 GBP
View
B
Retailer 5
-
$1,450 USD
View
Most Expensive
B
Do Amore Diamonds
27-B15B0D51F · Oct 31
$2,120 USD
View
5 more retailers have this diamond
Prices start from $250 USDSave up to $1,870 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
1.70ct Cushion
$250 USD