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Radiant|Lab Grown|IGI

1.56ct F SI1 Radiant Lab Grown Diamond

VG • F/SI1 • IGI LG508137440

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

Certificate IGI LG508137440

Diamond specifications and retailer prices

From $665 USD
As of November 6, 2026
Save $27 USD (4%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: $692 USD at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

About this 1.56ct lab-grown radiant diamond

This 1.56ct lab-grown radiant sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG508137440 or 508137440. Listed at 2 retailers as of November 5, 2026, with a relatively tight 4% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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

1.56
Carat
F
Color
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.7°
Pavilion angle34.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG508137440
Dimensions8.28 × 5.72 × 3.78 mm
L/W Ratio1.45
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
8.28 mm5.72 mm1.56 ctF / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG508137440
Side View
Table 64.5%Crown 43.7°Girdle: MED-STKPavilion 34.8°Culet: NoneDepth 66.1%

Caratlytics Score

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

Last verified: Nov 6
Current: $665 USD|Low: $639 USD|High: $822 USD|Avg: $709 USD|-19.1%
September 23, 2026
Retailer 1$665 USD

3 data points across 1 retailer

2 retailers$665 USD to $692 USD

B+
Cheapest Retailer
-
$665 USD
Most Expensive
B
Diamond Quarter
1.56SI1FLG405785N · Nov 5
$692 USD
£545 GBP
View
1 more retailer has this diamond
Prices start from $665 USDSave up to $27 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+
1.56ct Radiant
$665 USD