CaratHunter
Plans
Round|Natural|GIA

1.23ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 2564026489

Certificate GIA 2564026489

Diamond specifications and retailer prices

From £1,290 GBP
HK$13,500 HKD
As of October 31, 2026
Save £560 GBP (30%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £1,850 GBP at Michael Trio · As of October 27, 2026
View at Michael Trio

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2564026489. Listed at 6 retailers as of October 27, 2026, with prices from £1,290 to £1,850, a £560 spread on the same certified stone. Michael Trio lists it at £1,850. 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

1.23
Carat
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle33.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2564026489
Dimensions6.89 × 6.91 × 4.18 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Twinning Wisp, Crystal
Top View
6.89 mm6.91 mm1.23 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 2564026489
Side View
Table 59.0%Crown 33.5°Girdle: Slightly ThickPavilion 40.8°Culet: NoneDepth 60.6%

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: Oct 31
Current: £1,850 GBP|Low: £1,280 GBP|High: £1,926 GBP|Avg: £1,690 GBP|-4.0%
Michael Trio
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 31, 2026
Retailer 2£1,290 GBP
Retailer 6£1,578 GBP
Retailer 4£1,617 GBP
Retailer 3£1,642 GBP
Retailer 7£1,752 GBP
Retailer 5£1,791 GBP
Michael Trio£1,850 GBP

17 data points across 7 retailers

6 retailers£1,290 GBP to £1,850 GBP

A
Cheapest Retailer
-
£1,290 GBP
HK$13,500 HKD
A
Retailer 2
-
£1,578 GBP
$2,115 USD
View
A
Retailer 3
-
£1,617 GBP
$2,166 USD
View
Final sale: no returns
A
Retailer 4
-
£1,642 GBP
SGD 2,973 SGD
View
A
Retailer 5
-
£1,791 GBP
$2,400 USD
View
Most Expensive
B+
Michael Trio
2508674780 · Oct 27
£1,850 GBP
SGD 3,349 SGD
View
5 more retailers have this diamond
Prices start from £1,290 GBPSave up to £560 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
1.23ct Round
£1,290 GBP