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Round|Lab Grown|IGI

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 $321 AUD
As of November 5, 2026
Save $2,007 AUD (86%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $2,328 AUD 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 $321 to $2,328, a $2,007 spread on the same certified stone. Brilliant Earth lists it at $2,328. 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

How it works →
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: $2,328 AUD|Low: $309 AUD|High: $2,328 AUD|Avg: $844 AUD
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$321 AUD
Retailer 7$359 AUD
Retailer 3$373 AUD
Retailer 12$397 AUD
Retailer 11$536 AUD
Retailer 8$661 AUD
Retailer 6$731 AUD
Retailer 13$761 AUD
Retailer 5$1,163 AUD
Retailer 4$1,279 AUD
Retailer 2$1,283 AUD
Retailer 9$1,601 AUD
Brilliant Earth$2,328 AUD

43 data points across 13 retailers

19 retailers$321 AUD to $2,328 AUD

A
Cheapest Retailer
-
$321 AUD
A
Retailer 2
-
$359 AUD
View
Final sale: no returns
A
Retailer 3
-
$373 AUD
View
A
Retailer 4
-
$397 AUD
View
Retailer 5
-
$397 AUD
View
Price last confirmed 21 days ago
A
Retailer 6
-
$439 AUD
View
B+
Retailer 7
-
$536 AUD
View
A
Retailer 8
-
$661 AUD
View
A
Retailer 9
-
$666 AUD
View
A
Retailer 10
-
$731 AUD
View
B+
Retailer 11
-
$761 AUD
View
Retailer 12
-
$1,163 AUD
View
Price last confirmed 58 days ago
B
Retailer 13
-
$1,279 AUD
View
B
Retailer 14
-
$1,283 AUD
View
B
Retailer 15
-
$1,287 AUD
View
B
Retailer 16
-
$1,353 AUD
View
Retailer 17
-
$1,601 AUD
View
Price last confirmed 8 days ago
B
Retailer 18
-
$1,817 AUD
View
Most Expensive
B
Brilliant Earth
18623571A · Nov 5
$2,328 AUD
$1,630 USD
View
18 more retailers have this diamond
Prices start from $321 AUDSave up to $2,007 AUD

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
$321 AUD