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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 HK$1,765 HKD
As of November 5, 2026
Save HK$11,023 HKD (86%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: HK$12,788 HKD 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 HK$1,765 to HK$12,788, a HK$11,023 spread on the same certified stone. Brilliant Earth lists it at HK$12,788. 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: HK$12,788 HKD|Low: HK$1,695 HKD|High: HK$12,788 HKD|Avg: HK$4,633 HKD
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 10HK$1,765 HKD
Retailer 7HK$1,969 HKD
Retailer 3HK$2,048 HKD
Retailer 12HK$2,181 HKD
Retailer 11HK$2,942 HKD
Retailer 8HK$3,632 HKD
Retailer 6HK$4,017 HKD
Retailer 13HK$4,181 HKD
Retailer 5HK$6,386 HKD
Retailer 4HK$7,021 HKD
Retailer 2HK$7,045 HKD
Retailer 9HK$8,794 HKD
Brilliant EarthHK$12,788 HKD

43 data points across 13 retailers

19 retailersHK$1,765 HKD to HK$12,788 HKD

A
Cheapest Retailer
-
HK$1,765 HKD
A
Retailer 2
-
HK$1,969 HKD
View
Final sale: no returns
A
Retailer 3
-
HK$2,048 HKD
View
A
Retailer 4
-
HK$2,181 HKD
View
Retailer 5
-
HK$2,181 HKD
View
Price last confirmed 21 days ago
A
Retailer 6
-
HK$2,408 HKD
View
B+
Retailer 7
-
HK$2,942 HKD
View
A
Retailer 8
-
HK$3,632 HKD
View
A
Retailer 9
-
HK$3,656 HKD
View
A
Retailer 10
-
HK$4,017 HKD
View
B+
Retailer 11
-
HK$4,181 HKD
View
Retailer 12
-
HK$6,386 HKD
View
Price last confirmed 58 days ago
B
Retailer 13
-
HK$7,021 HKD
View
B
Retailer 14
-
HK$7,045 HKD
View
B
Retailer 15
-
HK$7,069 HKD
View
B
Retailer 16
-
HK$7,429 HKD
View
Retailer 17
-
HK$8,794 HKD
View
Price last confirmed 8 days ago
B
Retailer 18
-
HK$9,979 HKD
View
Most Expensive
B
Brilliant Earth
18623571A · Nov 5
HK$12,788 HKD
$1,630 USD
View
18 more retailers have this diamond
Prices start from HK$1,765 HKDSave up to HK$11,023 HKD

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
HK$1,765 HKD