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1.21ct G SI1 Round Lab Grown Diamond

EX • G/SI1 • IGI LG598387229

Shape and cutting style on the report: Round brilliant

Certificate IGI LG598387229

Diamond specifications and retailer prices

From $462 USD
As of November 1, 2026
Save $1,056 USD (70%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $1,518 USD at MOH London · As of October 28, 2026
View at MOH London

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG598387229 or 598387229. Listed at 9 retailers as of October 28, 2026, with prices from $462 to $1,518, a $1,056 spread on the same certified stone. MOH London lists it at $1,518. 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
G
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.7°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG598387229
Dimensions6.94 × 6.88 × 4.17 mm
L/W Ratio1.01
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
6.94 mm6.88 mm1.21 ctG / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG598387229
Side View
Table 60.0%Crown 32.7°Girdle: MediumPavilion 41.2°Culet: NoneDepth 60.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: $1,518 USD|Low: $244 USD|High: $1,534 USD|Avg: $566 USD|+0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 2, 2026
Retailer 11$293 USD
Retailer 12$342 USD
Retailer 3$354 USD
Retailer 4$373 USD
Retailer 10$378 USD
Retailer 8$462 USD
Retailer 5$535 USD
Retailer 6$550 USD
Retailer 9$617 USD
Retailer 2$671 USD
Retailer 7$1,162 USD
MOH London$1,518 USD

36 data points across 12 retailers

9 retailers$462 USD to $1,518 USD

B+
Cheapest Retailer
-
$462 USD
B+
Retailer 2
-
$535 USD
View
B+
Retailer 3
-
$550 USD
View
B+
Retailer 4
-
$617 USD
View
B
Retailer 5
-
$671 USD
£528 GBP
View
B
Retailer 6
-
$1,162 USD
View
Retailer 7
-
$1,216 USD
View
Price last confirmed 42 days ago
B
Retailer 8
-
$1,263 USD
View
Most Expensive
B
MOH London
LG598387229 · Oct 26
$1,518 USD
£1,195 GBP
View
8 more retailers have this diamond
Prices start from $462 USDSave up to $1,056 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
$462 USD