Radiant|Lab Grown|IGI

1.21ct D IF Radiant Lab Grown Diamond

VG • D/IF • IGI LG815606188

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

Certificate IGI LG815606188

Diamond specifications and retailer prices

From $265 USD
As of November 4, 2026
Save $757 USD (74%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $1,194 USD at MOH London · As of October 26, 2026
View at MOH London

About this 1.21ct lab-grown radiant diamond

This 1.21ct lab-grown radiant sits in the classic one-carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG815606188 or 815606188. Listed at 15 retailers as of November 3, 2026, with a 286% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.21
Carat
D
Color
IF
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.8°
Pavilion angle36.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG815606188
Dimensions7.38 × 5.23 × 3.64 mm
L/W Ratio1.41
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.38 mm5.23 mm1.21 ctD / IF
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG815606188
Side View
Table 66.0%Crown 41.8°Girdle: STK-THKPavilion 36.1°Culet: NoneDepth 69.6%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $1,194 USD|Low: $265 USD|High: $1,228 USD|Avg: $724 USD|-2.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
November 4, 2026
Retailer 10$265 USD
Retailer 8$275 USD
Retailer 5$398 USD
Retailer 14$509 USD
Retailer 13$532 USD
Retailer 2$550 USD
Retailer 4$609 USD
Retailer 12$720 USD
Retailer 3$764 USD
Retailer 9$949 USD
Retailer 6$953 USD
Retailer 11$997 USD
Retailer 7$1,022 USD
MOH London$1,194 USD

24 data points across 14 retailers

15 retailers$265 USD to $1,022 USD

A
Cheapest Retailer
-
$265 USD
Final sale: no returns
A
Retailer 2
-
$275 USD
View
A
Retailer 3
-
$398 USD
View
A
Retailer 4
-
$509 USD
View
A
Retailer 5
-
$532 USD
View
A
Retailer 6
-
$550 USD
View
A
Retailer 7
-
$609 USD
View
B+
Retailer 8
-
$720 USD
View
B+
Retailer 9
-
$764 USD
View
B+
Retailer 10
-
$949 USD
View
B+
Retailer 11
-
$953 USD
View
B+
Retailer 12
-
$997 USD
View
B+
Retailer 13
-
$1,022 USD
View
Retailer 14
-
$1,186 USD
View
Price last confirmed 30 days ago
Most Expensive
MOH London
LG815606188 · Oct 26
$1,194 USD
£940 GBP
View
Price last confirmed 8 days ago
14 more retailers have this diamond
Prices start from $265 USDSave up to $757 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.

A
1.21ct Radiant
$265 USD