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Round|Lab Grown|IGI

1.21ct D VS1 Round Lab Grown Diamond

ID • D/VS1 • IGI LG778645955

Shape and cutting style on the report: Round brilliant

Certificate IGI LG778645955

Diamond specifications and retailer prices

From $187 USD
As of November 3, 2026
Save $964 USD (84%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: $2,134 USD at Queensmith · As of October 27, 2026
View at Queensmith

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG778645955 or 778645955. Listed at 23 retailers as of November 3, 2026, with a 516% 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
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.9°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG778645955
Dimensions6.91 × 6.94 × 4.15 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.91 mm6.94 mm1.21 ctD / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG778645955
Side View
Table 58.0%Crown 33.9°Girdle: MediumPavilion 40.5°Culet: NoneDepth 60.0%

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: Nov 3
Current: $748 USD|Low: $179 USD|High: $1,097 USD|Avg: $524 USD|+26.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 4, 2026
Retailer 13$187 USD
Retailer 2$232 USD
Retailer 3$312 USD
Retailer 7$392 USD
Retailer 10$400 USD
Retailer 6$415 USD
Retailer 8$428 USD
Retailer 12$463 USD
Retailer 9$565 USD
Retailer 5$745 USD
Retailer 1$748 USD
Retailer 4$777 USD
Retailer 11$1,083 USD

41 data points across 13 retailers

23 retailers$187 USD to $1,151 USD

A
Cheapest Retailer
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$187 USD
A
Retailer 2
-
$209 USD
View
Final sale: no returns
A
Retailer 3
-
$217 USD
View
A
Retailer 4
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$232 USD
View
Retailer 5
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$232 USD
View
Price last confirmed 10 days ago
A
Retailer 6
-
$256 USD
View
B+
Retailer 7
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$312 USD
View
A
Retailer 8
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$392 USD
View
A
Retailer 9
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$393 USD
View
A
Retailer 10
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$400 USD
View
A
Retailer 11
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$415 USD
View
B+
Retailer 12
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$428 USD
View
B+
Retailer 13
-
$463 USD
View
B+
Retailer 14
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$565 USD
View
B+
Retailer 15
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$599 USD
View
B
Retailer 16
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$745 USD
View
B
Retailer 17
-
$748 USD
View
B
Retailer 18
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$755 USD
View
B
Retailer 19
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$777 USD
View
B
Retailer 20
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$799 USD
View
B
Retailer 21
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$1,083 USD
View
B
Retailer 22
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$1,151 USD
View
Most Expensive
Queensmith
LG778645955 · Oct 27
$2,134 USD
£1,680 GBP
View
Price last confirmed 7 days ago
22 more retailers have this diamond
Prices start from $187 USDSave up to $964 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
$187 USD