Zirconium:

• When oxidized, black surface is as hard as a sapphire
• Scratch-resistant
• Hypoallergenic
• Great for two-toned designs
• Unlike black tungsten, black is permanent
• Commonly used to make swords and knives
• Can be removed with a standard ring cutter

 

Ceramic:

• Lightweight
• Extremely Scratch Resistant
• Color is permanent and goes all the way through
• Commonly used in aerospace technology
• Can be removed with vice grips

 

Tungston:

• Extremely scratch-resistant
• Will not bend
• Permanently Polished
• Dark Gray color
• Commonly used as machining tools
• Can be removed with vice grips

 

Cobalt:

• Hypoallergenic and Biocompatible
• Heavier than titanium, lighter than tungsten
• White, platinum-like color
• Scratch resistant
• Shatterproof
• Commonly used in the  medical field
• Can be removed with a standard ring cutter

 

 

Damascus Steel:

• Lightweight
• Extremely scratch resistant
• Color in permanent and goes all the way through
• Commonly used in aerospace technology
• Can be removed with vice grips