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Round|Lab Grown|GIA

1.20ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • GIA 5503786487

Certificate GIA 5503786487

Diamond specifications and retailer prices

From £145 GBP
$193 USD
As of October 29, 2026
Save £698 GBP (83%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £843 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 1.2ct lab-grown round diamond

This 1.2ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5503786487. Listed at 14 retailers as of October 29, 2026, with prices from £145 to £843, a £698 spread on the same certified stone. MOH London lists it at £843. 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

1.20
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.2°
OriginLab Grown
Grading LabGIA
CertificateGIA 5503786487
Dimensions6.80 × 6.77 × 4.23 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
6.80 mm6.77 mm1.20 ctD / SI1
OriginLab Grown
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateGIA 5503786487
Side View
Table 58.0%Crown 35°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.3%

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: Oct 29
Current: £843 GBP|Low: £139 GBP|High: £849 GBP|Avg: £326 GBP|-0.7%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 29, 2026
Retailer 8£145 GBP
Retailer 3£162 GBP
Retailer 9£179 GBP
Retailer 10£179 GBP
Retailer 7£240 GBP
Retailer 5£293 GBP
Retailer 2£293 GBP
Retailer 4£357 GBP
Retailer 11£363 GBP
Retailer 6£579 GBP
MOH London£843 GBP

43 data points across 11 retailers

14 retailers£145 GBP to £843 GBP

A
Cheapest Retailer
-
£145 GBP
$193 USD
A
Retailer 2
-
£162 GBP
$216 USD
View
Final sale: no returns
A
Retailer 3
-
£168 GBP
$224 USD
View
A
Retailer 4
-
£179 GBP
$239 USD
View
A
Retailer 5
-
£179 GBP
$239 USD
View
B+
Retailer 6
-
£240 GBP
$320 USD
View
A
Retailer 7
-
£293 GBP
€371 EUR
View
A
Retailer 8
-
£293 GBP
View
B+
Retailer 9
-
£336 GBP
$447 USD
View
B+
Retailer 10
-
£357 GBP
View
B+
Retailer 11
-
£363 GBP
$484 USD
View
B
Retailer 12
-
£577 GBP
$768 USD
View
B
Retailer 13
-
£579 GBP
$771 USD
View
Most Expensive
B
MOH London
5503786487 · Oct 29
£843 GBP
View
13 more retailers have this diamond
Prices start from £145 GBPSave up to £698 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
1.20ct Round
£145 GBP