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Round|Lab Grown|IGI

1.21ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG487108246

Shape and cutting style on the report: Round brilliant

Certificate IGI LG487108246

Diamond specifications and retailer prices

From €823 EUR
$920 USD
As of October 31, 2026
Save €713 EUR (46%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: €2,133 EUR at Friendly Diamonds · As of November 2, 2026
View at Friendly Diamonds

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG487108246 or 487108246. Listed at 11 retailers as of October 31, 2026, with a 87% 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

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG487108246
Dimensions6.90 × 6.87 × 4.17 mm
L/W Ratio1.00
Girdle conditionFaceted
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
6.90 mm6.87 mm1.21 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG487108246
Side View
Table 58.5%Crown 35.2°Girdle: MediumPavilion 40.2°Culet: NoneDepth 60.6%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: €2,133 EUR|Low: €823 EUR|High: €3,291 EUR|Avg: €1,524 EUR
Friendly Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 5€823 EUR
Retailer 8€900 EUR
Retailer 9€925 EUR
Retailer 7€959 EUR
Retailer 3€1,472 EUR
Retailer 6€1,537 EUR
Retailer 2€1,797 EUR
Friendly Diamonds€2,133 EUR
Retailer 4€3,252 EUR

46 data points across 9 retailers

11 retailers€823 EUR to €1,537 EUR

B
Cheapest Retailer
-
€823 EUR
$920 USD
B
Retailer 2
-
€900 EUR
$1,005 USD
View
B
Retailer 3
-
€925 EUR
$1,033 USD
View
Final sale: no returns
Retailer 4
-
€946 EUR
$1,057 USD
View
Price last confirmed 62 days ago
Retailer 5
-
€959 EUR
$1,071 USD
View
Price last confirmed 20 days ago
B
Retailer 6
-
€1,114 EUR
$1,245 USD
View
B
Retailer 7
-
€1,472 EUR
£1,295 GBP
View
B
Retailer 8
-
€1,537 EUR
$1,717 USD
View
Retailer 9
-
€1,797 EUR
£1,581 GBP
View
Price under review
Most Expensive
Friendly Diamonds
1594948 · Nov 2
€2,133 EUR
$2,383 USD
View
Price under review
9 more retailers have this diamond
Prices start from €823 EURSave up to €713 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.

B
1.21ct Round
€823 EUR