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Radiant|Lab Grown|IGI

1.50ct E SI1 Radiant Lab Grown Diamond

EX • E/SI1 • IGI LG517284418

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG517284418

Diamond specifications and retailer prices

From $1,295 AUD
£716 GBP
As of October 29, 2026
Save $349 AUD (21%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $1,644 AUD at Taylor and Hart · As of October 26, 2026
View at Taylor and Hart

About this 1.5ct lab-grown radiant diamond

This 1.5ct lab-grown radiant 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 LG517284418 or 517284418. Listed at 2 retailers as of October 26, 2026, with prices from $1,295 to $1,644, a $349 spread on the same certified stone. Taylor and Hart lists it at $1,644. 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

1.50
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.4°
Pavilion angle27.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG517284418
Dimensions8.05 × 5.53 × 3.61 mm
L/W Ratio1.46
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
8.05 mm5.53 mm1.50 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG517284418
Side View
Table 63.5%Crown 40.4°Girdle: MED-STKPavilion 27.8°Culet: NoneDepth 65.3%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 29
Current: $1,295 AUD|Low: $868 AUD|High: $1,644 AUD|Avg: $1,111 AUD
Retailer 1
Retailer 2
Retailer 3
Taylor and Hart
September 26, 2026
Retailer 2$868 AUD
Retailer 3$1,206 AUD
Retailer 1$1,295 AUD
Taylor and Hart$1,644 AUD

10 data points across 4 retailers

2 retailers$1,295 AUD to $1,644 AUD

B
Cheapest Retailer
-
$1,295 AUD
£716 GBP
Most Expensive
B
Taylor and Hart
35ZIMZC · Oct 26
$1,644 AUD
$1,155 USD
View
1 more retailer has this diamond
Prices start from $1,295 AUDSave up to $349 AUD

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
1.50ct Radiant
$1,295 AUD