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1.55ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG778645865

Shape and cutting style on the report: Round brilliant

Certificate IGI LG778645865

Diamond specifications and retailer prices

From $400 NZD
As of November 5, 2026
Save $2,499 NZD (86%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $2,900 NZD at Brilliant Earth · As of November 5, 2026
View at Brilliant Earth

About this 1.55ct lab-grown round diamond

This 1.55ct 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 LG778645865 or 778645865. Listed at 19 retailers as of November 5, 2026, with prices from $400 to $2,900, a $2,499 spread on the same certified stone. Brilliant Earth lists it at $2,900. 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

1.55
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG778645865
Dimensions7.39 × 7.43 × 4.55 mm
L/W Ratio1.01
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
7.39 mm7.43 mm1.55 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG778645865
Side View
Table 58.0%Crown 35.4°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 61.5%

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: Nov 5
Current: $2,900 NZD|Low: $384 NZD|High: $2,900 NZD|Avg: $1,051 NZD
Brilliant Earth
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 6, 2026
Retailer 10$400 NZD
Retailer 8$447 NZD
Retailer 3$464 NZD
Retailer 12$495 NZD
Retailer 11$667 NZD
Retailer 2$897 NZD
Retailer 7$911 NZD
Retailer 13$948 NZD
Retailer 5$1,448 NZD
Retailer 4$1,592 NZD
Retailer 6$1,597 NZD
Retailer 9$1,994 NZD
Brilliant Earth$2,900 NZD

43 data points across 13 retailers

19 retailers$400 NZD to $2,900 NZD

A
Cheapest Retailer
-
$400 NZD
A
Retailer 2
-
$447 NZD
View
Final sale: no returns
A
Retailer 3
-
$464 NZD
View
A
Retailer 4
-
$495 NZD
View
Retailer 5
-
$495 NZD
View
Price last confirmed 21 days ago
A
Retailer 6
-
$546 NZD
View
B+
Retailer 7
-
$667 NZD
View
A
Retailer 8
-
$829 NZD
View
A
Retailer 9
-
$897 NZD
View
A
Retailer 10
-
$911 NZD
View
B+
Retailer 11
-
$948 NZD
View
Retailer 12
-
$1,448 NZD
View
Price last confirmed 58 days ago
B
Retailer 13
-
$1,592 NZD
View
B
Retailer 14
-
$1,597 NZD
View
B
Retailer 15
-
$1,603 NZD
View
B
Retailer 16
-
$1,685 NZD
View
Retailer 17
-
$1,994 NZD
View
Price last confirmed 8 days ago
B
Retailer 18
-
$2,263 NZD
View
Most Expensive
B
Brilliant Earth
18623571A · Nov 5
$2,900 NZD
$1,630 USD
View
18 more retailers have this diamond
Prices start from $400 NZDSave up to $2,499 NZD

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
1.55ct Round
$400 NZD