US Size 13.00

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Cubic Zirconia Engagement Ring- The Gwendolyn (Customizable Oval Cut 7-stone Prong-Set Design)
0.50 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Gwendolyn (Customizable Oval Cut 7-stone Prong-Set Design)

From $333.49 USD
Slip a finger into this slim and delicate engagement ring and be magically transported to a land far, far away where every woman is a princess. Your lady is a princess,...
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Cubic Zirconia Engagement Ring- The Gwendolyn (Customizable Pear Cut 7-stone Prong-Set Design)
0.50 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat3.00 Carat

Cubic Zirconia Engagement Ring- The Gwendolyn (Customizable Pear Cut 7-stone Prong-Set Design)

From $333.31 USD
Slip a finger into this slim and delicate engagement ring and be magically transported to a land far, far away where every woman is a princess. Your lady is a princess,...
Quick view
Cubic Zirconia Engagement Ring- The Gwendolyn (Customizable Princess/Square Cut 7-stone Prong-Set Design)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Gwendolyn (Customizable Princess/Square Cut 7-stone Prong-Set Design)

From $334.03 USD
Slip a finger into this slim and delicate engagement ring and be magically transported to a land far, far away where every woman is a princess. Your lady is a princess,...
Quick view
Cubic Zirconia Engagement Ring- The Gwendolyn (Customizable Radiant Cut 7-stone Prong-Set Design)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Gwendolyn (Customizable Radiant Cut 7-stone Prong-Set Design)

From $331.56 USD
Slip a finger into this slim and delicate engagement ring and be magically transported to a land far, far away where every woman is a princess. Your lady is a princess,...
Quick view
Cubic Zirconia Engagement Ring- The Gwendolyn (Customizable Round Cut 7-stone Prong-Set Design)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat3.00 Carat3.50 Carat2.00 Carat2.50 Carat

Cubic Zirconia Engagement Ring- The Gwendolyn (Customizable Round Cut 7-stone Prong-Set Design)

From $343.42 USD
Slip a finger into this slim and delicate engagement ring and be magically transported to a land far, far away where every woman is a princess. Your lady is a princess,...
Quick view
Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Asscher Cut Style featuring Peekaboo Trellis Hidden Stones)
0.65 Carat1.00 Carat1.50 Carat2.50 Carat

Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Asscher Cut Style featuring Peekaboo Trellis Hidden Stones)

From $281.33 USD
Sometimes a woman may do things for attention. And sometimes more attention is the last thing you want or need! Introducing The Heilanda engagement ring: an artisan-inspired, 3-sided, ultra-thin-banded ring...
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Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Cushion Cut Style featuring Peekaboo Trellis Hidden Stones)
0.65 Carat1.00 Carat1.50 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Cushion Cut Style featuring Peekaboo Trellis Hidden Stones)

From $277.31 USD
Sometimes a woman may do things for attention. And sometimes more attention is the last thing you want or need! Introducing The Heilanda engagement ring: an artisan-inspired, 3-sided, ultra-thin-banded ring...
Quick view
Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Emerald Cut Style featuring Peekaboo Trellis Hidden Stones)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat

Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Emerald Cut Style featuring Peekaboo Trellis Hidden Stones)

From $294.80 USD
Sometimes a woman may do things for attention. And sometimes more attention is the last thing you want or need! Introducing The Heilanda engagement ring: an artisan-inspired, 3-sided, ultra-thin-banded ring...
Quick view
Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Oval Cut Style featuring Peekaboo Trellis Hidden Stones)
0.50 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat

Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Oval Cut Style featuring Peekaboo Trellis Hidden Stones)

From $296.72 USD
Sometimes a woman may do things for attention. And sometimes more attention is the last thing you want or need! Introducing The Heilanda engagement ring: an artisan-inspired, 3-sided, ultra-thin-banded ring...
Quick view
Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Princess/Square Cut Style featuring Peekaboo Trellis Hidden Stones)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Princess/Square Cut Style featuring Peekaboo Trellis Hidden Stones)

From $296.86 USD
Sometimes a woman may do things for attention. And sometimes more attention is the last thing you want or need! Introducing The Heilanda engagement ring: an artisan-inspired, 3-sided, ultra-thin-banded ring...
Quick view
Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Radiant Cut Style featuring Peekaboo Trellis Hidden Stones)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat

Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Radiant Cut Style featuring Peekaboo Trellis Hidden Stones)

From $294.80 USD
Sometimes a woman may do things for attention. And sometimes more attention is the last thing you want or need! Introducing The Heilanda engagement ring: an artisan-inspired, 3-sided, ultra-thin-banded ring...
Quick view
Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Round Cut Style featuring Peekaboo Trellis Hidden Stones)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.00 Carat3.50 Carat

Cubic Zirconia Engagement Ring- The Heilanda (Customizable Cathedral-set Round Cut Style featuring Peekaboo Trellis Hidden Stones)

From $319.48 USD
Sometimes a woman may do things for attention. And sometimes more attention is the last thing you want or need! Introducing The Heilanda engagement ring: an artisan-inspired, 3-sided, ultra-thin-banded ring...
Quick view
Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Asscher Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)
0.65 Carat1.00 Carat1.50 Carat2.50 Carat

Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Asscher Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)

From $542.14 USD
Aloha! This happenin' enhanced three-stone ring is cooler than a grass skirt on a windy day. A 5A diamond-quality Asscher cut cubic zirconia center stone sits pretty in a prong...
Quick view
Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Cushion Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)
0.65 Carat1.00 Carat1.50 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Cushion Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)

From $532.90 USD
Aloha! This happenin' enhanced three-stone ring is cooler than a grass skirt on a windy day. A 5A diamond-quality Cushion cut cubic zirconia center stone sits pretty in a prong...
Quick view
Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Emerald Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)
1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat

Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Emerald Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)

From $591.97 USD
Aloha! This happenin' enhanced three-stone ring is cooler than a grass skirt on a windy day. A 5A diamond-quality Emerald cut cubic zirconia center stone sits pretty in a prong...
Quick view
Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Oval Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)
1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat

Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Oval Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)

From $596.26 USD
Aloha! This happenin' enhanced three-stone ring is cooler than a grass skirt on a windy day. A 5A diamond-quality Oval cut cubic zirconia center stone sits pretty in a prong...
Quick view
Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Princess/Square Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Princess/Square Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)

From $562.79 USD
Aloha! This happenin' enhanced three-stone ring is cooler than a grass skirt on a windy day. A 5A diamond-quality Princess/Square cut cubic zirconia center stone sits pretty in a prong...
Quick view
Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Radiant Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)
1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat

Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Radiant Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)

From $591.97 USD
Aloha! This happenin' enhanced three-stone ring is cooler than a grass skirt on a windy day. A 5A diamond-quality Radiant cut cubic zirconia center stone sits pretty in a prong...
Quick view
Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Round Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.50 Carat3.00 Carat3.50 Carat2.00 Carat

Cubic Zirconia Engagement Ring- The Iekika (Customizable 3-stone Round Cut Design with Multi-Halo Enhancement and 150+-stone Pavé Band)

From $614.74 USD
Aloha! This happenin' enhanced three-stone ring is cooler than a grass skirt on a windy day. A 5A diamond-quality Round cut cubic zirconia center stone sits pretty in a prong...
Quick view
Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Asscher Cut Design with Halo and Tri-Cluster Band Accents)
0.65 Carat1.00 Carat1.50 Carat2.50 Carat

Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Asscher Cut Design with Halo and Tri-Cluster Band Accents)

From $292.61 USD
We can thank the 1970s Russian scientists for first creating the basic process we use today to create diamond-simulant, man-made cubic zirconia in the laboratory. We'll take credit for bringing...
Quick view
Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Cushion Cut Design with Halo and Tri-Cluster Band Accents)
0.65 Carat1.00 Carat1.50 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Cushion Cut Design with Halo and Tri-Cluster Band Accents)

From $288.65 USD
We can thank the 1970s Russian scientists for first creating the basic process we use today to create diamond-simulant, man-made cubic zirconia in the laboratory. We'll take credit for bringing...
Quick view
Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Emerald Cut Design with Halo and Tri-Cluster Band Accents)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat8.50 Carat

Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Emerald Cut Design with Halo and Tri-Cluster Band Accents)

From $306.23 USD
We can thank the 1970s Russian scientists for first creating the basic process we use today to create diamond-simulant, man-made cubic zirconia in the laboratory. We'll take credit for bringing...
Quick view
Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Marquise Cut Design with Halo and Tri-Cluster Band Accents)
0.25 Carat0.30 Carat0.38 Carat0.50 Carat0.75 Carat1.00 Carat2.00 Carat

Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Marquise Cut Design with Halo and Tri-Cluster Band Accents)

From $291.16 USD
We can thank the 1970s Russian scientists for first creating the basic process we use today to create diamond-simulant, man-made cubic zirconia in the laboratory. We'll take credit for bringing...
Quick view
Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Oval Cut Design with Halo and Tri-Cluster Band Accents)
0.50 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat5.50 Carat

Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Oval Cut Design with Halo and Tri-Cluster Band Accents)

From $308.21 USD
We can thank the 1970s Russian scientists for first creating the basic process we use today to create diamond-simulant, man-made cubic zirconia in the laboratory. We'll take credit for bringing...
Quick view
Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Princess/Square Cut Design with Halo and Tri-Cluster Band Accents)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Princess/Square Cut Design with Halo and Tri-Cluster Band Accents)

From $340.55 USD
We can thank the 1970s Russian scientists for first creating the basic process we use today to create diamond-simulant, man-made cubic zirconia in the laboratory. We'll take credit for bringing...
Quick view
Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Radiant Cut Design with Halo and Tri-Cluster Band Accents)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat8.50 Carat

Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Radiant Cut Design with Halo and Tri-Cluster Band Accents)

From $306.23 USD
We can thank the 1970s Russian scientists for first creating the basic process we use today to create diamond-simulant, man-made cubic zirconia in the laboratory. We'll take credit for bringing...
Quick view
Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Round Cut Design with Halo and Tri-Cluster Band Accents)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.50 Carat3.00 Carat3.50 Carat2.00 Carat

Cubic Zirconia Engagement Ring- The Ina Vaani (Customizable Cathedral-raised Round Cut Design with Halo and Tri-Cluster Band Accents)

From $503.40 USD
We can thank the 1970s Russian scientists for first creating the basic process we use today to create diamond-simulant, man-made cubic zirconia in the laboratory. We'll take credit for bringing...
Quick view
Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Asscher Cut Center with Round-Bezel Side Stones)
0.65 Carat1.00 Carat1.50 Carat

Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Asscher Cut Center with Round-Bezel Side Stones)

From $373.63 USD
Her beauty and delicate calming presence precedes her everywhere she goes, a simple yet resplendent symmetry resulting in bedazzled stares from strangers and even a silent hush from normally barking...
Quick view
Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Cushion Cut Center with Round-Bezel Side Stones)
0.65 Carat1.00 Carat1.50 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Cushion Cut Center with Round-Bezel Side Stones)

From $369.62 USD
Her beauty and delicate calming presence precedes her everywhere she goes, a simple yet resplendent symmetry resulting in bedazzled stares from strangers and even a silent hush from normally barking...
Quick view
Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Emerald Cut Center with Round-Bezel Side Stones)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat

Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Emerald Cut Center with Round-Bezel Side Stones)

From $388.09 USD
Her beauty and delicate calming presence precedes her everywhere she goes, a simple yet resplendent symmetry resulting in bedazzled stares from strangers and even a silent hush from normally barking...
Quick view
Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Heart Cut Center with Round-Bezel Side Stones)
0.50 Carat0.75 Carat1.50 Carat2.00 Carat

Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Heart Cut Center with Round-Bezel Side Stones)

From $364.52 USD
Her beauty and delicate calming presence precedes her everywhere she goes, a simple yet resplendent symmetry resulting in bedazzled stares from strangers and even a silent hush from normally barking...
Quick view
Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Marquise Cut Center with Round-Bezel Side Stones)
0.50 Carat0.75 Carat1.00 Carat2.00 Carat

Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Marquise Cut Center with Round-Bezel Side Stones)

From $430.90 USD
Her beauty and delicate calming presence precedes her everywhere she goes, a simple yet resplendent symmetry resulting in bedazzled stares from strangers and even a silent hush from normally barking...
Quick view
Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Oval Cut Center with Round-Bezel Side Stones)
0.50 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat

Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Oval Cut Center with Round-Bezel Side Stones)

From $389.13 USD
Her beauty and delicate calming presence precedes her everywhere she goes, a simple yet resplendent symmetry resulting in bedazzled stares from strangers and even a silent hush from normally barking...
Quick view
Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Pear Cut Center with Round-Bezel Side Stones)
0.50 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat3.00 Carat

Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Pear Cut Center with Round-Bezel Side Stones)

From $388.92 USD
Her beauty and delicate calming presence precedes her everywhere she goes, a simple yet resplendent symmetry resulting in bedazzled stares from strangers and even a silent hush from normally barking...
Quick view
Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Princess/Square Cut Center with Round-Bezel Side Stones)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Princess/Square Cut Center with Round-Bezel Side Stones)

From $389.41 USD
Her beauty and delicate calming presence precedes her everywhere she goes, a simple yet resplendent symmetry resulting in bedazzled stares from strangers and even a silent hush from normally barking...
Quick view
Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Radiant Cut Center with Round-Bezel Side Stones)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat

Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Radiant Cut Center with Round-Bezel Side Stones)

From $387.23 USD
Her beauty and delicate calming presence precedes her everywhere she goes, a simple yet resplendent symmetry resulting in bedazzled stares from strangers and even a silent hush from normally barking...
Quick view
Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Round Cut Center with Round-Bezel Side Stones)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.50 Carat3.00 Carat3.50 Carat2.00 Carat

Cubic Zirconia Engagement Ring- The Irene (Customizable 7-stone Round Cut Center with Round-Bezel Side Stones)

From $397.86 USD
Her beauty and delicate calming presence precedes her everywhere she goes, a simple yet resplendent symmetry resulting in bedazzled stares from strangers and even a silent hush from normally barking...
Quick view
Cubic Zirconia Engagement Ring- The Jeanna (Customizable Asscher Cut 7-stone Style Enhanced with Bezel Accents and Shared Prong Band)
1.00 Carat1.50 Carat2.50 Carat

Cubic Zirconia Engagement Ring- The Jeanna (Customizable Asscher Cut 7-stone Style Enhanced with Bezel Accents and Shared Prong Band)

From $567.05 USD
It's the little idiosyncrasies that we love so much. The things you thought would drive you nuts, no... that's the good stuff. The lovely lass in your life has an...
Quick view
Cubic Zirconia Engagement Ring- The Jeanna (Customizable Cushion Cut 7-stone Style Enhanced with Bezel Accents and Shared Prong Band)
1.00 Carat1.50 Carat2.50 Carat3.50 Carat5.00 Carat9.50 Carat

Cubic Zirconia Engagement Ring- The Jeanna (Customizable Cushion Cut 7-stone Style Enhanced with Bezel Accents and Shared Prong Band)

From $564.22 USD
It's the little idiosyncrasies that we love so much. The things you thought would drive you nuts, no... that's the good stuff. The lovely lass in your life has an...
Quick view
Cubic Zirconia Engagement Ring- The Jeanna (Customizable Emerald Cut 7-stone Style Enhanced with Bezel Accents and Shared Prong Band)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Jeanna (Customizable Emerald Cut 7-stone Style Enhanced with Bezel Accents and Shared Prong Band)

From $553.74 USD
It's the little idiosyncrasies that we love so much. The things you thought would drive you nuts, no... that's the good stuff. The lovely lass in your life has an...
Quick view
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US Size 13.00 Cubic Zirconia Rings

This product collection has the CubicZirconia.com rings, engagement rings and wedding bands that can be manufactured in a U.S. finger ring size of 13.00.

You can see all available cubic zirconia ring sizes here, and filter our rings product catalog by any specific US ring size number. 

Not sure what your finger ring size actually is? Click here for tips and/or order our ring sizing kit to check. We can also help you with sneaky ninja tips to find what her finger ring size is for a confidential surprise gift without her knowing what you're doing!

If you're outside the United States, Canada and Mexico-- which all use the U.S. ring sizing system used primarily on this website store-- then maybe you need our international ring size chart to convert your known international ring size into a U.S. ring size.