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1.23ct I SI2 Round Lab Grown Diamond

VG • I/SI2 • GCAL 273350190

Shape and cutting style on the report: Round brilliant

Certificate GCAL 273350190

Diamond specifications and retailer prices

From £303 GBP
$406 USD
As of November 1, 2026
Save £590 GBP (66%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £893 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 1.23ct lab-grown round diamond

This 1.23ct lab-grown round sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a very-good cut grade and certified by GCAL 273350190. Listed at 4 retailers as of October 29, 2026, with prices from £303 to £893, a £590 spread on the same certified stone. MOH London lists it at £893. 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

1.23
Carat
I
Colour
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishGood
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.8°
OriginLab Grown
Grading LabGCAL
CertificateGCAL 273350190
Dimensions6.88 × 6.91 × 4.19 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.88 mm6.91 mm1.23 ctI / SI2
OriginLab Grown
CutVery Good
PolishGood
SymmetryExcellent
FluorescenceNone
CertificateGCAL 273350190
Side View
Table 60.0%Crown 35°Girdle: STK-STKPavilion 40.8°Culet: NoneDepth 60.7%

Caratlytics Score

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

Price History

Last verified: Nov 1
Current: £893 GBP|Low: £163 GBP|High: £893 GBP|Avg: £416 GBP|+6.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
October 29, 2026
Retailer 2£172 GBP
Retailer 3£303 GBP
Retailer 4£328 GBP
MOH London£893 GBP

11 data points across 4 retailers

4 retailers£303 GBP to £893 GBP

Retailer 1
-
£172 GBP
$231 USD
Price last confirmed 8 days ago
B+
Retailer 2
-
£303 GBP
$406 USD
View
B+
Retailer 3
-
£328 GBP
$440 USD
View
Most Expensive
B+
MOH London
273350190 · Oct 29
£893 GBP
View
3 more retailers have this diamond
Prices start from £303 GBPSave up to £590 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+
1.23ct Round
£303 GBP