CaratHunter
Plans
Radiant|Lab Grown|IGI

1.55ct D SI1 Radiant Lab Grown Diamond

EX • D/SI1

Diamond specifications and retailer prices

From £370 GBP
$496 USD
As of November 2, 2026
Save £835 GBP (69%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £1,205 GBP at NZ Jewellers · As of November 1, 2026
View at NZ Jewellers

About this 1.55ct lab-grown radiant diamond

This 1.55ct lab-grown radiant 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. Listed at 4 retailers as of November 1, 2026, with prices from £370 to £1,205, a £835 spread on the same certified stone. NZ Jewellers lists it at £1,205. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions7.49 × 5.78 × 3.93 mm
L/W Ratio1.30
Top View
7.49 mm5.78 mm1.55 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 65.5%CrownGirdlePavilionCulet: NoneDepth 68.0%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: £1,205 GBP|Low: £266 GBP|High: £1,205 GBP|Avg: £557 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 29, 2026
Retailer 7£266 GBP
Retailer 4£370 GBP
Retailer 3£414 GBP
Retailer 2£458 GBP
Retailer 5£512 GBP
Retailer 6£850 GBP
NZ Jewellers£1,205 GBP

8 data points across 7 retailers

4 retailers£370 GBP to £1,205 GBP

B+
Cheapest Retailer
-
£370 GBP
$496 USD
B+
Retailer 2
-
£414 GBP
$555 USD
View
B+
Retailer 3
-
£458 GBP
$615 USD
View
Most Expensive
C
NZ Jewellers
5e62c297-61fa-463e-8ceb-37a62756b469 · Nov 1
£1,205 GBP
$1,617 USD
View
3 more retailers have this diamond
Prices start from £370 GBPSave up to £835 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.

B+
1.55ct Radiant
£370 GBP