US Size 10.50

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Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Emerald Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Emerald Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)

From $511.11 USD
Some people think it takes a lot of effort to dominate a room. Yet catching the eye is half the work already done. The Honoka is a prong-set 5A diamond-quality...
Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Oval Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)
0.50 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Oval Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)

From $512.88 USD
Some people think it takes a lot of effort to dominate a room. Yet catching the eye is half the work already done. The Honoka is a prong-set 5A diamond-quality...
Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Pear Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)
0.50 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat3.00 Carat

Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Pear Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)

From $512.64 USD
Some people think it takes a lot of effort to dominate a room. Yet catching the eye is half the work already done. The Honoka is a prong-set 5A diamond-quality...
Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Princess/Square Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Princess/Square Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)

From $505.83 USD
Some people think it takes a lot of effort to dominate a room. Yet catching the eye is half the work already done. The Honoka is a prong-set 5A diamond-quality...
Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Radiant Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Radiant Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)

From $511.11 USD
Some people think it takes a lot of effort to dominate a room. Yet catching the eye is half the work already done. The Honoka is a prong-set 5A diamond-quality...
Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Round Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.50 Carat3.00 Carat3.50 Carat2.00 Carat

Cubic Zirconia Engagement Ring- The Honoka (Customizable Crown-Cathedral Round Cut Design with Clustered Large-Accent Halo & Ultra-thin Band)

From $530.42 USD
Some people think it takes a lot of effort to dominate a room. Yet catching the eye is half the work already done. The Honoka is a prong-set 5A diamond-quality...
Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Cushion Cut Design with Floral Segmented Halo & Milgrain+Accents Band)
0.65 Carat1.00 Carat1.50 Carat2.50 Carat3.50 Carat5.00 Carat9.50 Carat

Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Cushion Cut Design with Floral Segmented Halo & Milgrain+Accents Band)

From $336.18 USD
The Huá derives her name from the spoken Mandarin dialect of the Chinese language. The simple phonetic pronounced when saying this word aloud is one of the most-heard sounds on...
Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Emerald Cut Design with Floral Segmented Halo & Milgrain+Accents Band)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Emerald Cut Design with Floral Segmented Halo & Milgrain+Accents Band)

From $353.50 USD
The Huá derives her name from the spoken Mandarin dialect of the Chinese language. The simple phonetic pronounced when saying this word aloud is one of the most-heard sounds on...
Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Oval Cut Design with Floral Segmented Halo & Milgrain+Accents Band)
0.50 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Oval Cut Design with Floral Segmented Halo & Milgrain+Accents Band)

From $344.70 USD
The Huá derives her name from the spoken Mandarin dialect of the Chinese language. The simple phonetic pronounced when saying this word aloud is one of the most-heard sounds on...
Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Princess/Square Cut Design with Floral Segmented Halo & Milgrain+Accents Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Princess/Square Cut Design with Floral Segmented Halo & Milgrain+Accents Band)

From $386.04 USD
The Huá derives her name from the spoken Mandarin dialect of the Chinese language. The simple phonetic pronounced when saying this word aloud is one of the most-heard sounds on...
Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Radiant Cut Design with Floral Segmented Halo & Milgrain+Accents Band)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Radiant Cut Design with Floral Segmented Halo & Milgrain+Accents Band)

From $353.50 USD
The Huá derives her name from the spoken Mandarin dialect of the Chinese language. The simple phonetic pronounced when saying this word aloud is one of the most-heard sounds on...
Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Round Cut Design with Floral Segmented Halo & Milgrain+Accents Band)
0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat3.00 Carat3.50 Carat2.50 Carat

Cubic Zirconia Engagement Ring- The Huá (Customizable Cathedral-style Round Cut Design with Floral Segmented Halo & Milgrain+Accents Band)

From $391.06 USD
The Huá derives her name from the spoken Mandarin dialect of the Chinese language. The simple phonetic pronounced when saying this word aloud is one of the most-heard sounds on...
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...
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...
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...
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...
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...
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...
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...
Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Asscher Cut Center, Pear Accents and Split Band)
0.65 Carat1.00 Carat1.50 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Asscher Cut Center, Pear Accents and Split Band)

From $380.40 USD
The Ila is a simple, beautiful 5A Asscher Cut cubic zirconia engagement ring without an ounce of pretension. How can something so modest be so magnificent? Her organic 3-stone design...
Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Cushion Cut Center, Pear Accents and Split Band)
0.65 Carat1.00 Carat1.50 Carat2.50 Carat3.50 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Cushion Cut Center, Pear Accents and Split Band)

From $375.60 USD
The Ila is a simple, beautiful 5A Cushion Cut cubic zirconia engagement ring without an ounce of pretension. How can something so modest be so magnificent? Her organic 3-stone design...
Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Emerald Cut Center, Pear Accents and Split Band)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Emerald Cut Center, Pear Accents and Split Band)

From $395.23 USD
The Ila is a simple, beautiful 5A Emerald Cut cubic zirconia engagement ring without an ounce of pretension. How can something so modest be so magnificent? Her organic 3-stone design...
Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Heart Cut Center, Pear Accents and Split Band)
0.50 Carat0.75 Carat1.50 Carat2.00 Carat3.00 Carat4.00 Carat

Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Heart Cut Center, Pear Accents and Split Band)

From $372.12 USD
The Ila is a simple, beautiful 5A Heart Cut cubic zirconia engagement ring without an ounce of pretension. How can something so modest be so magnificent? Her organic 3-stone design...
Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Marquise Cut Center, Pear Accents and Split Band)
0.50 Carat0.75 Carat1.00 Carat2.00 Carat

Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Marquise Cut Center, Pear Accents and Split Band)

From $407.28 USD
The Ila is a simple, beautiful 5A Marquise Cut cubic zirconia engagement ring without an ounce of pretension. How can something so modest be so magnificent? Her organic 3-stone design...
Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Oval Cut Center, Pear Accents and Split Band)
0.50 Carat1.00 Carat1.50 Carat2.00 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Oval Cut Center, Pear Accents and Split Band)

From $391.07 USD
The Ila is a simple, beautiful 5A Oval Cut cubic zirconia engagement ring without an ounce of pretension. How can something so modest be so magnificent? Her organic 3-stone design...
Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Pear Cut Center, Pear Accents and Split Band)
0.50 Carat0.75 Carat1.00 Carat1.50 Carat2.00 Carat3.00 Carat

Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Pear Cut Center, Pear Accents and Split Band)

From $389.32 USD
The Ila is a simple, beautiful 5A Pear Cut cubic zirconia engagement ring without an ounce of pretension. How can something so modest be so magnificent? Her organic 3-stone design...
Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Princess Cut Center, Pear Accents and Split Band)
0.40 Carat0.50 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat3.50 Carat5.00 Carat0.65 Carat

Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Princess Cut Center, Pear Accents and Split Band)

From $361.79 USD
The Ila is a simple, beautiful 5A Princess Cut cubic zirconia engagement ring without an ounce of pretension. How can something so modest be so magnificent? Her organic 3-stone design...
Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Radiant Cut Center, Pear Accents and Split Band)
0.75 Carat1.00 Carat1.50 Carat2.50 Carat3.00 Carat4.00 Carat5.00 Carat

Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Radiant Cut Center, Pear Accents and Split Band)

From $395.23 USD
The Ila is a simple, beautiful 5A Radiant Cut cubic zirconia engagement ring without an ounce of pretension. How can something so modest be so magnificent? Her organic 3-stone design...
Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Round Cut Center, Pear Accents and Split Band)
0.25 Carat0.50 Carat0.75 Carat1.00 Carat1.50 Carat2.00 Carat2.50 Carat3.00 Carat3.50 Carat

Cubic Zirconia Engagement Ring- The Ila (Customizable 3-stone Design with Round Cut Center, Pear Accents and Split Band)

From $373.84 USD
The Ila is a simple, beautiful 5A Round Cut cubic zirconia engagement ring without an ounce of pretension. How can something so modest be so magnificent? Her organic 3-stone design...
Cubic Zirconia Engagement Ring- The Ilene (Customizable Princess Cut with Segmented Bouquet Semi-Halo)
0.40 Carat0.50 Carat0.65 Carat0.75 Carat1.00 Carat1.25 Carat1.50 Carat2.00 Carat

Cubic Zirconia Engagement Ring- The Ilene (Customizable Princess Cut with Segmented Bouquet Semi-Halo)

From $434.41 USD
The Ilene engagement ring stands strong, as a testament to the love, commitment and trust you feel toward her. She is the woman you want on your side, always. Like...
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...
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...
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...
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...
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...
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...
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...
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...
Cubic Zirconia Engagement Ring- The India (Customizable Cathedral-Prong Asscher Cut Solitaire)
0.65 Carat1.00 Carat1.50 Carat

Cubic Zirconia Engagement Ring- The India (Customizable Cathedral-Prong Asscher Cut Solitaire)

From $251.41 USD
We respect traditions around the world...but we also believe in the human right to make your own choices. We first made The India engagement ring for a man and a...
Cubic Zirconia Engagement Ring- The India (Customizable Cathedral-Prong Cushion Cut Solitaire)
0.65 Carat1.00 Carat1.50 Carat

Cubic Zirconia Engagement Ring- The India (Customizable Cathedral-Prong Cushion Cut Solitaire)

From $247.49 USD
We respect traditions around the world...but we also believe in the human right to make your own choices. We first made The India engagement ring for a man and a...

US Size 10.50 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 10.50.

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.