Round|Natural|GIA

4.51ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6511140946

Certificate GIA 6511140946

Diamond specifications and retailer prices

From $87,350 USD
As of October 30, 2026
Save $28,529 USD (25%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $115,879 USD at Diamond Quarter · As of November 2, 2026
View at Diamond Quarter

About this 4.51ct natural round diamond

This 4.51ct natural round sits in the three to five carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6511140946. Listed at 4 retailers as of October 30, 2026, with prices from $87,350 to $115,879, a $28,529 spread on the same certified stone. Diamond Quarter lists it at $115,879. 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

4.51
Carat
H
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 6511140946
Dimensions10.53 × 10.45 × 6.62 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
10.53 mm10.45 mm4.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6511140946
Side View
Table 58.0%Crown 35°Girdle: Slightly ThickPavilion 41.6°Culet: NoneDepth 63.1%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 30
Current: $87,350 USD|Low: $66,256 USD|High: $91,020 USD|Avg: $80,647 USD
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 2, 2026
Retailer 5$66,256 USD
Retailer 9$67,848 USD
Retailer 8$76,011 USD
Retailer 3$80,277 USD
Retailer 10$81,208 USD
Retailer 6$82,820 USD
Retailer 1$87,350 USD
Retailer 2$87,705 USD
Retailer 7$89,329 USD
Retailer 4$91,020 USD

2 data points across 10 retailers

4 retailers$87,350 USD to $115,879 USD

Retailer 1
-
$67,848 USD
Price last confirmed 50 days ago
Retailer 2
-
$82,820 USD
View
Price last confirmed 45 days ago
B
Retailer 3
-
$87,350 USD
View
Most Expensive
B
Diamond Quarter
4.51SI1H6546B9B4N · Nov 2
$115,879 USD
£91,243 GBP
View
3 more retailers have this diamond
Prices start from $87,350 USDSave up to $28,529 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.

B
4.51ct Round
$87,350 USD