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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 $920 USD
As of November 5, 2026
Save $797 USD (46%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $2,383 USD at Friendly Diamonds · As of November 4, 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 November 4, 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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Price History

Last verified: Nov 5
Current: $2,383 USD|Low: $920 USD|High: $3,676 USD|Avg: $1,708 USD
Friendly Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 5$920 USD
Retailer 8$1,005 USD
Retailer 9$1,033 USD
Retailer 7$1,071 USD
Retailer 4$1,629 USD
Retailer 6$1,717 USD
Retailer 2$1,996 USD
Friendly Diamonds$2,383 USD
Retailer 3$3,623 USD

46 data points across 9 retailers

11 retailers$920 USD to $1,717 USD

B
Cheapest Retailer
-
$920 USD
B
Retailer 2
-
$1,005 USD
View
B
Retailer 3
-
$1,033 USD
View
Final sale: no returns
Retailer 4
-
$1,057 USD
View
Price last confirmed 66 days ago
Retailer 5
-
$1,071 USD
View
Price last confirmed 25 days ago
B
Retailer 6
-
$1,245 USD
View
B
Retailer 7
-
$1,629 USD
View
B
Retailer 8
-
$1,717 USD
View
Retailer 9
-
$1,996 USD
View
Price under review
Most Expensive
Friendly Diamonds
1594948 · Nov 4
$2,383 USD
View
Price under review
9 more retailers have this diamond
Prices start from $920 USDSave up to $797 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
1.21ct Round
$920 USD