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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 €348 EUR
As of November 6, 2026
Save €1,026 EUR (75%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: €1,665 EUR at MOH London · As of November 5, 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 6, 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
Colour
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 6
Current: €1,665 EUR|Low: €348 EUR|High: €1,689 EUR|Avg: €917 EUR|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
November 7, 2026
Retailer 4€348 EUR
Retailer 2€694 EUR
Retailer 3€806 EUR
MOH London€1,665 EUR

42 data points across 4 retailers

5 retailers€348 EUR to €1,374 EUR

A
Cheapest Retailer
-
€348 EUR
Final sale: no returns
B+
Retailer 2
-
€694 EUR
View
B
Retailer 3
-
€806 EUR
View
B
Retailer 4
-
€1,374 EUR
View
Most Expensive
MOH London
1505842159 · Nov 5
€1,665 EUR
£1,464 GBP
View
Price under review
4 more retailers have this diamond
Prices start from €348 EURSave up to €1,026 EUR

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
€348 EUR