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Cushion|Lab Grown|IGI

1.67ct D SI1 Cushion Lab Grown Diamond

GD • D/SI1 • IGI LG538297406

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG538297406

Diamond specifications and retailer prices

From £170 GBP
$228 USD
As of October 30, 2026
Save £949 GBP (85%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,119 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.67ct lab-grown cushion diamond

This 1.67ct 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 standard cut grade and certified by IGI LG538297406 or 538297406. Listed at 14 retailers as of October 29, 2026, with prices from £170 to £1,119, a £949 spread on the same certified stone. Brilliant Earth lists it at £1,119. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.67
Carat
D
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.8°
Pavilion angle31.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG538297406
Dimensions6.62 × 6.59 × 4.27 mm
L/W Ratio1.00
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
6.62 mm6.59 mm1.67 ctD / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG538297406
Side View
Table 63.0%Crown 37.8°Girdle: THK-VTKPavilion 31.9°Culet: NoneDepth 64.8%

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 30
Current: £1,119 GBP|Low: £170 GBP|High: £1,194 GBP|Avg: £493 GBP|-6.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 31, 2026
Retailer 11£170 GBP
Retailer 9£190 GBP
Retailer 7£255 GBP
Retailer 2£309 GBP
Retailer 4£345 GBP
Retailer 3£384 GBP
Retailer 10£441 GBP
Retailer 5£459 GBP
Retailer 8£780 GBP
Retailer 6£890 GBP
Brilliant Earth£1,119 GBP

44 data points across 11 retailers

14 retailers£170 GBP to £1,119 GBP

A
Cheapest Retailer
-
£170 GBP
$228 USD
Final sale: no returns
B+
Retailer 2
-
£190 GBP
$254 USD
View
B+
Retailer 3
-
£255 GBP
$342 USD
View
A
Retailer 4
-
£309 GBP
€394 EUR
View
B+
Retailer 5
-
£345 GBP
View
B+
Retailer 6
-
£384 GBP
$514 USD
View
B+
Retailer 7
-
£437 GBP
$585 USD
View
B+
Retailer 8
-
£441 GBP
$591 USD
View
B+
Retailer 9
-
£459 GBP
$615 USD
View
B
Retailer 10
-
£648 GBP
$869 USD
View
Retailer 11
-
£780 GBP
$1,045 USD
View
Price last confirmed 10 days ago
B
Retailer 12
-
£890 GBP
View
B
Retailer 13
-
£902 GBP
$1,208 USD
View
Most Expensive
B
Brilliant Earth
10789091A · Oct 29
£1,119 GBP
$1,500 USD
View
13 more retailers have this diamond
Prices start from £170 GBPSave up to £949 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
1.67ct Cushion
£170 GBP