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Radiant|Lab Grown|IGI

1.05ct D SI1 Radiant Lab Grown Diamond

ID • D/SI1 • IGI LG474120580

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

Certificate IGI LG474120580

Diamond specifications and retailer prices

From $1,047 NZD
£464 GBP
As of November 2, 2026
Save $286 NZD (21%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $1,333 NZD at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 1.05ct lab-grown radiant diamond

This 1.05ct lab-grown radiant sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG474120580 or 474120580. Listed at 2 retailers as of November 2, 2026, with prices from $1,047 to $1,333, a $286 spread on the same certified stone. Brilliant Earth lists it at $1,333. 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

1.05
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.9°
Pavilion angle32.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG474120580
Dimensions6.45 × 5.14 × 3.53 mm
L/W Ratio1.25
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
6.45 mm5.14 mm1.05 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG474120580
Side View
Table 65.0%Crown 42.9°Girdle: MED-STKPavilion 32.1°Culet: NoneDepth 68.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 2
Current: $1,333 NZD|Low: $540 NZD|High: $1,333 NZD|Avg: $920 NZD
Brilliant Earth
Retailer 2
Retailer 3
January 4, 2026
Retailer 2$540 NZD
Retailer 3$835 NZD
Brilliant Earth$1,333 NZD

10 data points across 3 retailers

2 retailers$1,047 NZD to $1,333 NZD

B+
Cheapest Retailer
-
$1,047 NZD
£464 GBP
Most Expensive
B
Brilliant Earth
4791918Y · Nov 2
$1,333 NZD
$750 USD
View
1 more retailer has this diamond
Prices start from $1,047 NZDSave up to $286 NZD

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+
1.05ct Radiant
$1,047 NZD