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Cushion|Lab Grown|IGI

1.70ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG600340947

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG600340947

Diamond specifications and retailer prices

From £174 GBP
$232 USD
As of October 28, 2026
Save £1,185 GBP (87%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,359 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG600340947 or 600340947. Listed at 12 retailers as of October 28, 2026, with prices from £174 to £1,359, a £1,185 spread on the same certified stone. Brilliant Earth lists it at £1,359. 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
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle32.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG600340947
Dimensions7.30 × 6.55 × 4.31 mm
L/W Ratio1.11
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
7.30 mm6.55 mm1.70 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG600340947
Side View
Table 59.0%Crown 35°Girdle: STK-THKPavilion 32.2°Culet: NoneDepth 65.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 28
Current: £356 GBP|Low: £174 GBP|High: £915 GBP|Avg: £467 GBP|+4.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 29, 2026
Retailer 9£174 GBP
Retailer 10£221 GBP
Retailer 5£249 GBP
Retailer 7£261 GBP
Retailer 1£356 GBP
Retailer 11£391 GBP
Retailer 12£418 GBP
Retailer 4£519 GBP
Retailer 2£628 GBP
Retailer 3£662 GBP
Retailer 6£779 GBP
Retailer 8£915 GBP

39 data points across 12 retailers

12 retailers£174 GBP to £1,359 GBP

A
Cheapest Retailer
-
£174 GBP
$232 USD
Final sale: no returns
A
Retailer 2
-
£221 GBP
HK$2,300 HKD
View
A
Retailer 3
-
£249 GBP
View
B+
Retailer 4
-
£261 GBP
$348 USD
View
A
Retailer 5
-
£356 GBP
View
A
Retailer 6
-
£391 GBP
$521 USD
View
A
Retailer 7
-
£418 GBP
$556 USD
View
B+
Retailer 8
-
£628 GBP
SGD 1,131 SGD
View
B+
Retailer 9
-
£662 GBP
$881 USD
View
B+
Retailer 10
-
£779 GBP
View
B
Retailer 11
-
£915 GBP
$1,218 USD
View
Most Expensive
B
Brilliant Earth
22273641A · Oct 29
£1,359 GBP
$1,810 USD
View
11 more retailers have this diamond
Prices start from £174 GBPSave up to £1,185 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
1.70ct Cushion
£174 GBP