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Round|Lab Grown|GIA

1.21ct E SI1 Round Lab Grown Diamond

EX • E/SI1 • GIA 2497979319

Shape and cutting style on the report: Round

Certificate GIA 2497979319

Diamond specifications and retailer prices

From $399 USD
As of October 30, 2026
Save $621 USD (61%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $1,020 USD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2497979319. Listed at 6 retailers as of October 30, 2026, with prices from $399 to $1,020, a $621 spread on the same certified stone. Brilliant Earth lists it at $1,020. 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
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle41.4°
OriginLab Grown
Grading LabGIA
CertificateGIA 2497979319
Dimensions6.86 × 6.89 × 4.22 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Top View
6.86 mm6.89 mm1.21 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2497979319
Side View
Table 59.0%Crown 34°Girdle: MediumPavilion 41.4°Culet: NoneDepth 61.4%

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: $1,020 USD|Low: $392 USD|High: $1,987 USD|Avg: $1,034 USD|-10.5%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 31, 2026
Retailer 8$399 USD
Retailer 7$602 USD
Retailer 6$657 USD
Retailer 2$737 USD
Retailer 5$772 USD
Brilliant Earth$1,020 USD
Retailer 3$1,050 USD
Retailer 11$1,050 USD
Retailer 4$1,109 USD
Retailer 10$1,320 USD
Retailer 9$1,681 USD
Retailer 12$1,987 USD

20 data points across 12 retailers

6 retailers$399 USD to $1,020 USD

A
Cheapest Retailer
-
$399 USD
B+
Retailer 2
-
$602 USD
HK$4,700 HKD
View
B
Retailer 3
-
$657 USD
View
B
Retailer 4
-
$737 USD
€702 EUR
View
B
Retailer 5
-
$772 USD
A$1,188 AUD
View
Most Expensive
B
Brilliant Earth
11210145A · Oct 31
$1,020 USD
View
5 more retailers have this diamond
Prices start from $399 USDSave up to $621 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 Round
$399 USD