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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 €200 EUR
As of November 5, 2026
Save €1,252 EUR (86%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: €1,452 EUR 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 €200 to €1,452, a €1,252 spread on the same certified stone. Brilliant Earth lists it at €1,452. 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: €1,452 EUR|Low: €192 EUR|High: €1,452 EUR|Avg: €526 EUR
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€200 EUR
Retailer 8€224 EUR
Retailer 3€233 EUR
Retailer 12€248 EUR
Retailer 11€334 EUR
Retailer 2€449 EUR
Retailer 7€456 EUR
Retailer 13€475 EUR
Retailer 5€725 EUR
Retailer 4€797 EUR
Retailer 6€800 EUR
Retailer 9€999 EUR
Brilliant Earth€1,452 EUR

43 data points across 13 retailers

19 retailers€200 EUR to €1,452 EUR

A
Cheapest Retailer
-
€200 EUR
A
Retailer 2
-
€224 EUR
View
Final sale: no returns
A
Retailer 3
-
€233 EUR
View
A
Retailer 4
-
€248 EUR
View
Retailer 5
-
€248 EUR
View
Price last confirmed 21 days ago
A
Retailer 6
-
€274 EUR
View
B+
Retailer 7
-
€334 EUR
View
A
Retailer 8
-
€415 EUR
View
A
Retailer 9
-
€449 EUR
View
A
Retailer 10
-
€456 EUR
View
B+
Retailer 11
-
€475 EUR
View
Retailer 12
-
€725 EUR
View
Price last confirmed 58 days ago
B
Retailer 13
-
€797 EUR
View
B
Retailer 14
-
€800 EUR
View
B
Retailer 15
-
€803 EUR
View
B
Retailer 16
-
€844 EUR
View
Retailer 17
-
€999 EUR
View
Price last confirmed 8 days ago
B
Retailer 18
-
€1,133 EUR
View
Most Expensive
B
Brilliant Earth
18623571A · Nov 5
€1,452 EUR
$1,630 USD
View
18 more retailers have this diamond
Prices start from €200 EURSave up to €1,252 EUR

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
€200 EUR