Radiant|Lab Grown|IGI

1.21ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG735580809

Shape and cutting style on the report: Cut cornered rectangular mixed cut

Certificate IGI LG735580809

Diamond specifications and retailer prices

From $293 USD
As of October 30, 2026
Save $1,197 USD (80%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $1,920 USD at Rare Carat · As of September 28, 2026
View at Rare Carat

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 top-tier cut grade and certified by IGI LG735580809 or 735580809. Listed at 20 retailers as of October 30, 2026, with a 409% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
D
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle25.5°
Pavilion angle33.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG735580809
Dimensions7.65 × 4.90 × 3.18 mm
L/W Ratio1.56
Culet sizeLong
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.65 mm4.90 mm1.21 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG735580809
Side View
Table 60.0%Crown 25.5°Girdle: MED-STKPavilion 33.4°Culet: LNGDepth 64.9%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $1,920 USD|Low: $281 USD|High: $1,920 USD|Avg: $795 USD
Rare Carat
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
Retailer 15
Retailer 16
November 2, 2026
Retailer 16$293 USD
Retailer 7$328 USD
Retailer 5$340 USD
Retailer 3$363 USD
Retailer 6$363 USD
Retailer 15$505 USD
Retailer 13$520 USD
Retailer 11$586 USD
Retailer 2$626 USD
Retailer 10$643 USD
Retailer 14$968 USD
Retailer 4$1,167 USD
Retailer 12$1,216 USD
Retailer 8$1,417 USD
Retailer 9$1,455 USD
Rare Carat$1,920 USD

44 data points across 16 retailers

20 retailers$293 USD to $1,490 USD

A
Cheapest Retailer
-
$293 USD
A
Retailer 2
-
$328 USD
View
Final sale: no returns
A
Retailer 3
-
$340 USD
View
Retailer 4
-
$363 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
$363 USD
View
A
Retailer 6
-
$505 USD
View
A
Retailer 7
-
$520 USD
View
A
Retailer 8
-
$586 USD
€558 EUR
View
A
Retailer 9
-
$626 USD
View
A
Retailer 10
-
$626 USD
ZAR 10,116 ZAR
View
A
Retailer 11
-
$643 USD
£506 GBP
View
B+
Retailer 12
-
$968 USD
View
B
Retailer 13
-
$1,167 USD
View
B+
Retailer 14
-
$1,216 USD
A$1,870 AUD
View
B
Retailer 15
-
$1,216 USD
View
B
Retailer 16
-
$1,339 USD
View
B
Retailer 17
-
$1,417 USD
£1,116 GBP
View
B
Retailer 18
-
$1,455 USD
£1,146 GBP
View
B
Retailer 19
-
$1,490 USD
View
Most Expensive
Rare Carat
91965A_l_735580809 · Sep 28
$1,920 USD
View
Price last confirmed 34 days ago
19 more retailers have this diamond
Prices start from $293 USDSave up to $1,197 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
$293 USD