CaratHunter
Plans
Marquise|Natural|GIA

1.23ct F SI1 Marquise Natural Diamond

GD • F/SI1 • GIA 2125061627

Certificate GIA 2125061627

Diamond specifications and retailer prices

From $12,259 AUD
As of November 7, 2026
Save $2,185 AUD (15%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $18,450 AUD at MOH London · As of November 4, 2026
View at MOH London

About this 1.23ct natural marquise diamond

This 1.23ct natural marquise sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 2125061627. Listed at 5 retailers as of November 3, 2026, with a relatively tight 18% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
F
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryGood
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 2125061627
Dimensions11.28 × 5.26 × 3.67 mm
L/W Ratio2.14
Top View
11.28 mm5.26 mm1.23 ctF / SI1
OriginNatural
CutGood
PolishVery Good
SymmetryGood
FluorescenceMedium
CertificateGIA 2125061627
Side View
Table 50.0%CrownGirdlePavilionCuletDepth 69.8%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 7
Current: $18,450 AUD|Low: $12,259 AUD|High: $18,722 AUD|Avg: $14,538 AUD|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 7, 2026
Retailer 2$12,259 AUD
Retailer 4$12,506 AUD
Retailer 3$14,443 AUD
Retailer 5$14,617 AUD
MOH London$18,450 AUD

46 data points across 5 retailers

5 retailers$12,259 AUD to $14,443 AUD

B
Cheapest Retailer
-
$12,259 AUD
Retailer 2
-
$12,506 AUD
View
Price last confirmed 15 days ago
C
Retailer 3
-
$14,443 AUD
View
Retailer 4
-
$14,617 AUD
View
Price last confirmed 15 days ago
Most Expensive
MOH London
8447EB51D · Nov 4
$18,450 AUD
£9,982 GBP
View
Price under review
4 more retailers have this diamond
Prices start from $12,259 AUDSave up to $2,185 AUD

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 Marquise
$12,259 AUD