Round|Natural|GIA

1.20ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5566279707

Certificate GIA 5566279707

Diamond specifications and retailer prices

From $2,496 USD
As of November 6, 2026
Save $3,053 USD (55%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $6,191 USD at Queensmith · As of October 28, 2026
View at Queensmith

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5566279707. Listed at 22 retailers as of November 2, 2026, with a 122% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
H
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 5566279707
Dimensions6.75 × 6.70 × 4.23 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle, Indented Natural, Natural, Extra Facet
Top View
6.75 mm6.70 mm1.20 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 5566279707
Side View
Table 59.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.9%

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 6
Current: $6,191 USD|Low: $2,496 USD|High: $6,210 USD|Avg: $3,926 USD|+2.7%
Queensmith
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 9$2,496 USD
Retailer 2$2,594 USD
Retailer 6$2,917 USD
Retailer 10$3,070 USD
Retailer 3$3,175 USD
Retailer 4$3,392 USD
Retailer 7$3,872 USD
Retailer 5$4,050 USD
Retailer 8$5,549 USD
Queensmith$6,191 USD

24 data points across 10 retailers

22 retailers$2,496 USD to $5,549 USD

A
Cheapest Retailer
-
$2,496 USD
A
Retailer 2
-
$2,594 USD
View
A
Retailer 3
-
$2,917 USD
View
B+
Retailer 4
-
$2,971 USD
View
B+
Retailer 5
-
$3,062 USD
View
Final sale: no returns
B+
Retailer 6
-
$3,070 USD
View
B+
Retailer 7
-
$3,070 USD
View
B+
Retailer 8
-
$3,175 USD
View
Retailer 9
-
$3,319 USD
View
Price last confirmed 19 days ago
Retailer 10
-
$3,319 USD
View
Price last confirmed 25 days ago
B+
Retailer 11
-
$3,350 USD
View
B+
Retailer 12
-
$3,392 USD
View
Retailer 13
-
$3,446 USD
View
Price last confirmed 22 days ago
B+
Retailer 14
-
$3,462 USD
View
B+
Retailer 15
-
$3,478 USD
View
Retailer 16
-
$3,558 USD
View
Price last confirmed 33 days ago
Retailer 17
-
$3,829 USD
View
Price last confirmed 19 days ago
B
Retailer 18
-
$3,872 USD
View
B+
Retailer 19
-
$4,050 USD
View
B
Retailer 20
-
$5,549 USD
View
Retailer 21
-
$5,782 USD
View
Price last confirmed 20 days ago
Most Expensive
Queensmith
5566279707 · Oct 28
$6,191 USD
£4,875 GBP
View
Price last confirmed 8 days ago
21 more retailers have this diamond
Prices start from $2,496 USDSave up to $3,053 USD

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
$2,496 USD