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Round|Lab Grown|IGI

1.09ct D SI2 Round Lab Grown Diamond

EX • D/SI2 • IGI LG472170728

Shape and cutting style on the report: Round brilliant

Certificate IGI LG472170728

Diamond specifications and retailer prices

From $640 USD
As of October 29, 2026
Save $771 USD (55%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $2,074 USD at Friendly Diamonds · As of October 30, 2026
View at Friendly Diamonds

About this 1.09ct lab-grown round diamond

This 1.09ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG472170728 or 472170728. Listed at 11 retailers as of October 29, 2026, with a 120% 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

1.09
Carat
D
Color
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.1°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG472170728
Dimensions6.51 × 6.49 × 4.13 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
6.51 mm6.49 mm1.09 ctD / SI2
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG472170728
Side View
Table 57.5%Crown 36.1°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 63.5%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: $2,074 USD|Low: $600 USD|High: $3,466 USD|Avg: $1,343 USD
Friendly Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 31, 2026
Retailer 6$640 USD
Retailer 5$752 USD
Retailer 9$818 USD
Retailer 11$841 USD
Retailer 3$872 USD
Retailer 7$872 USD
Retailer 2$1,396 USD
Retailer 8$1,411 USD
Friendly Diamonds$2,074 USD
Retailer 10$2,452 USD
Retailer 4$3,429 USD

42 data points across 11 retailers

11 retailers$640 USD to $1,411 USD

B
Cheapest Retailer
-
$640 USD
B
Retailer 2
-
$752 USD
View
B
Retailer 3
-
$818 USD
View
B
Retailer 4
-
$841 USD
View
Final sale: no returns
Retailer 5
-
$872 USD
View
Price last confirmed 19 days ago
B
Retailer 6
-
$872 USD
View
B
Retailer 7
-
$1,396 USD
£1,099 GBP
View
B
Retailer 8
-
$1,411 USD
View
Most Expensive
Friendly Diamonds
1589421 · Oct 30
$2,074 USD
View
Price under review
8 more retailers have this diamond
Prices start from $640 USDSave up to $771 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
1.09ct Round
$640 USD