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Radiant|Lab Grown|GIA

1.21ct F SI1 Radiant Lab Grown Diamond

ID • F/SI1 • GIA 1505842159

Certificate GIA 1505842159

Diamond specifications and retailer prices

From $389 USD
As of November 1, 2026
Save $1,145 USD (75%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $1,864 USD at MOH London · As of November 3, 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1505842159. Listed at 5 retailers as of November 1, 2026, with a 294% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.21
Carat
F
Color
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabGIA
CertificateGIA 1505842159
Dimensions7.58 × 5.33 × 3.60 mm
L/W Ratio1.42
Girdle conditionPolished
Cert comments
This is a man-made diamond produced by CVD (Chemical Vapor Deposition) growth process and has evidence of post-growth treatments to change the color.
Key to symbols
Growth Remnant
Top View
7.58 mm5.33 mm1.21 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1505842159
Side View
Table 66.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 67.6%

Caratlytics Score

How it works →
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 1
Current: $1,864 USD|Low: $389 USD|High: $1,886 USD|Avg: $1,020 USD|-1.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
November 3, 2026
Retailer 4$389 USD
Retailer 2$784 USD
Retailer 3$900 USD
MOH London$1,864 USD

40 data points across 4 retailers

5 retailers$389 USD to $1,534 USD

A
Cheapest Retailer
-
$389 USD
Final sale: no returns
B+
Retailer 2
-
$784 USD
£617 GBP
View
B
Retailer 3
-
$900 USD
View
B
Retailer 4
-
$1,534 USD
View
Most Expensive
MOH London
1505842159 · Nov 3
$1,864 USD
£1,468 GBP
View
Price under review
4 more retailers have this diamond
Prices start from $389 USDSave up to $1,145 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
$389 USD