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 $589 USD
£464 GBP
As of October 31, 2026
Save $161 USD (21%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $750 USD at Brilliant Earth · As of October 31, 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 October 31, 2026, with prices from $589 to $750, a $161 spread on the same certified stone. Brilliant Earth lists it at $750. 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
Color
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

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Oct 31
Current: $750 USD|Low: $304 USD|High: $750 USD|Avg: $518 USD
Brilliant Earth
Retailer 2
Retailer 3
January 4, 2026
Retailer 2$304 USD
Retailer 3$470 USD
Brilliant Earth$750 USD

10 data points across 3 retailers

2 retailers$589 USD to $750 USD

B+
Cheapest Retailer
-
$589 USD
£464 GBP
Most Expensive
B
Brilliant Earth
4791918Y · Oct 31
$750 USD
View
1 more retailer has this diamond
Prices start from $589 USDSave up to $161 USD

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
$589 USD