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Marquise|Natural|GIA

0.78ct J SI1 Marquise Natural Diamond

EX • J/SI1 • GIA 1236939128

Certificate GIA 1236939128

Diamond specifications and retailer prices

From £727 GBP
$975 USD
As of November 1, 2026
Save £876 GBP (55%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £1,602 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 0.78ct natural marquise diamond

This 0.78ct natural marquise sits in the just-under-one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1236939128. Listed at 8 retailers as of October 29, 2026, with prices from £727 to £1,602, a £876 spread on the same certified stone. MOH London lists it at £1,602. 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

0.78
Carat
J
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishGood
SymmetryGood
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1236939128
Dimensions8.87 × 4.91 × 3.24 mm
L/W Ratio1.81
Girdle conditionFaceted
Culet sizeNone
Top View
8.87 mm4.91 mm0.78 ctJ / SI1
OriginNatural
CutExcellent
PolishGood
SymmetryGood
FluorescenceFaint
CertificateGIA 1236939128
Side View
Table 56.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 66.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £1,602 GBP|Low: £727 GBP|High: £1,613 GBP|Avg: £1,050 GBP|+0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 4£727 GBP
Retailer 8£898 GBP
Retailer 6£961 GBP
Retailer 7£961 GBP
Retailer 5£991 GBP
Retailer 3£993 GBP
Retailer 2£1,217 GBP
MOH London£1,602 GBP

44 data points across 8 retailers

8 retailers£727 GBP to £1,602 GBP

A
Cheapest Retailer
-
£727 GBP
$975 USD
B+
Retailer 2
-
£898 GBP
$1,205 USD
View
B+
Retailer 3
-
£961 GBP
$1,290 USD
View
B+
Retailer 4
-
£961 GBP
$1,290 USD
View
B+
Retailer 5
-
£991 GBP
$1,330 USD
View
B+
Retailer 6
-
£993 GBP
View
B
Retailer 7
-
£1,217 GBP
€1,555 EUR
View
Most Expensive
B
MOH London
7A9F724BF · Oct 29
£1,602 GBP
View
7 more retailers have this diamond
Prices start from £727 GBPSave up to £876 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
0.78ct Marquise
£727 GBP