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Round|Lab Grown|IGI

1.55ct D SI1 Round Lab Grown Diamond

VG • D/SI1 • IGI LG784643985

Shape and cutting style on the report: Round brilliant

Certificate IGI LG784643985

Diamond specifications and retailer prices

From £152 GBP
As of November 1, 2026
Save £829 GBP (85%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £981 GBP at Brilliant Earth · As of November 3, 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 very-good cut grade and certified by IGI LG784643985 or 784643985. Listed at 14 retailers as of November 1, 2026, with prices from £152 to £981, a £829 spread on the same certified stone. Brilliant Earth lists it at £981. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.55
Carat
D
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle37°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG784643985
Dimensions7.41 × 7.32 × 4.55 mm
L/W Ratio1.01
Girdle conditionFaceted
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
7.41 mm7.32 mm1.55 ctD / SI1
OriginLab Grown
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG784643985
Side View
Table 59.0%Crown 37°Girdle: MED-THKPavilion 40.4°Culet: NoneDepth 61.6%

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 1
Current: £981 GBP|Low: £95 GBP|High: £1,248 GBP|Avg: £464 GBP|-21.4%
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
Retailer 14
Retailer 15
November 4, 2026
Retailer 7£95 GBP
Retailer 12£152 GBP
Retailer 13£169 GBP
Retailer 3£187 GBP
Retailer 8£312 GBP
Retailer 15£325 GBP
Retailer 11£340 GBP
Retailer 4£342 GBP
Retailer 14£379 GBP
Retailer 10£503 GBP
Retailer 2£550 GBP
Retailer 6£642 GBP
Retailer 9£876 GBP
Retailer 5£895 GBP
Brilliant Earth£981 GBP

35 data points across 15 retailers

14 retailers£152 GBP to £981 GBP

A
Cheapest Retailer
-
£152 GBP
A
Retailer 2
-
£169 GBP
View
Final sale: no returns
Retailer 3
-
£185 GBP
View
Price last confirmed 52 days ago
Retailer 4
-
£187 GBP
View
Price last confirmed 12 days ago
A
Retailer 5
-
£312 GBP
View
B+
Retailer 6
-
£325 GBP
View
B+
Retailer 7
-
£340 GBP
View
B+
Retailer 8
-
£342 GBP
View
B+
Retailer 9
-
£379 GBP
View
B+
Retailer 10
-
£503 GBP
View
B
Retailer 11
-
£550 GBP
View
B
Retailer 12
-
£642 GBP
View
B
Retailer 13
-
£876 GBP
View
Most Expensive
B
Brilliant Earth
20185628A · Nov 3
£981 GBP
$1,320 USD
View
13 more retailers have this diamond
Prices start from £152 GBPSave up to £829 GBP

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
£152 GBP