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Cushion|Lab Grown|IGI

3.50ct D SI1 Cushion Lab Grown Diamond

VG • D/SI1 • IGI LG689557987

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG689557987

Diamond specifications and retailer prices

From £857 GBP
$1,148 USD
As of October 30, 2026
Save £3,696 GBP (81%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £4,553 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 3.5ct lab-grown cushion diamond

This 3.5ct lab-grown cushion sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG689557987 or 689557987. Listed at 3 retailers as of October 30, 2026, with prices from £857 to £4,553, a £3,696 spread on the same certified stone. Do Amore Diamonds lists it at £4,553. 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

3.50
Carat
D
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.7°
Pavilion angle39.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG689557987
Dimensions8.95 × 8.52 × 5.88 mm
L/W Ratio1.05
Girdle conditionFaceted
Culet sizePointed
Cert comments
Pre-existing laser inscription on girdle. As Grown - No indication of post-growth treatment.. This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process.
Top View
8.95 mm8.52 mm3.50 ctD / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG689557987
Side View
Table 59.0%Crown 39.7°Girdle: STK-VTKPavilion 39.1°Culet: NoneDepth 69.0%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £4,553 GBP|Low: £857 GBP|High: £4,553 GBP|Avg: £1,770 GBP
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 19, 2026
Retailer 3£857 GBP
Retailer 6£869 GBP
Retailer 5£1,116 GBP
Retailer 4£1,230 GBP
Retailer 2£1,985 GBP
Do Amore Diamonds£4,553 GBP

4 data points across 6 retailers

3 retailers£857 GBP to £4,553 GBP

B+
Cheapest Retailer
-
£857 GBP
$1,148 USD
Retailer 2
-
£1,985 GBP
$2,660 USD
View
Price last confirmed 9 days ago
Most Expensive
C
Do Amore Diamonds
7-1685352 · Oct 31
£4,553 GBP
$6,100 USD
View
2 more retailers have this diamond
Prices start from £857 GBPSave up to £3,696 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.

B+
3.50ct Cushion
£857 GBP