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Round|Lab Grown|IGI

1.70ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG591368554

Shape and cutting style on the report: Round brilliant

Certificate IGI LG591368554

Diamond specifications and retailer prices

From $231 USD
As of October 29, 2026
Save $1,119 USD (83%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $1,350 USD at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.7ct lab-grown round diamond

This 1.7ct lab-grown round sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG591368554 or 591368554. Listed at 16 retailers as of October 29, 2026, with prices from $231 to $1,350, a $1,119 spread on the same certified stone. Brilliant Earth lists it at $1,350. 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

1.70
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG591368554
Dimensions7.71 × 7.69 × 4.69 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
7.71 mm7.69 mm1.70 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG591368554
Side View
Table 58.0%Crown 34.3°Girdle: MediumPavilion 41°Culet: NoneDepth 60.9%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: $1,350 USD|Low: $222 USD|High: $1,380 USD|Avg: $617 USD|+4.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 1, 2026
Retailer 10$231 USD
Retailer 3$268 USD
Retailer 11$287 USD
Retailer 9$388 USD
Retailer 5$447 USD
Retailer 7$474 USD
Retailer 6$539 USD
Retailer 12$546 USD
Retailer 8$734 USD
Retailer 4$922 USD
Retailer 2$1,149 USD
Brilliant Earth$1,350 USD

42 data points across 12 retailers

16 retailers$231 USD to $1,350 USD

A
Cheapest Retailer
-
$231 USD
A
Retailer 2
-
$268 USD
View
A
Retailer 3
-
$287 USD
View
Price last confirmed 7 days ago
A
Retailer 4
-
$287 USD
View
B+
Retailer 5
-
$388 USD
View
A
Retailer 6
-
$447 USD
£352 GBP
View
A
Retailer 7
-
$474 USD
€451 EUR
View
A
Retailer 8
-
$539 USD
£425 GBP
View
A
Retailer 9
-
$545 USD
View
A
Retailer 10
-
$546 USD
View
B+
Retailer 11
-
$734 USD
View
B
Retailer 12
-
$922 USD
View
Retailer 13
-
$944 USD
View
Price last confirmed 112 days ago
B
Retailer 14
-
$974 USD
View
B
Retailer 15
-
$1,149 USD
£905 GBP
View
Most Expensive
B
Brilliant Earth
21312027A · Oct 31
$1,350 USD
View
15 more retailers have this diamond
Prices start from $231 USDSave up to $1,119 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
1.70ct Round
$231 USD