Is Iridium Hypoallergenic or Allergenic? Is it Toxic?

Iridium is hypoallergenic and is one of the precious metals least likely to cause allergic reactions.

However, while iridium is hypoallergenic, it can still be alloyed with allergenic metals which would then cause problems for people with metal allergies.

For example, there’s known cases of people reacting to iridium in Platinum Iridium (900 Plat – 100Irid), even though iridium makes up just 10% of that alloy

Learn more below!

Here’s an awesome quiz about iridium’s allergenic properties. Take it after you’ve read my guide for your best results.

Can You Be Allergic to Iridium?

Yes, you can be allergic to iridium even though iridium is a hypoallergenic precious metal.

A recent study showed that roughly 1% of participants (common people so we can assume this would translate to 1% of the general population) were allergic to iridium when exposed to it.

1% isn’t a lot, but if you’re that one person out of a hundred, than it’s a big problem.

What are the Symptoms of Iridium Allergy?

Symptoms of a iridium allergy are itchy, red skin with possible swelling, blisters, and dryness.

A rash will appear where the skin has been in touch with iridium.

Inhaling soluble iridium salts leads to respiratory symptoms and contact urticaria.

Is Iridium Jewelry Hypoallergenic?

Yes, iridium jewelry is hypoallergenic if the jewelry is made from pure iridium and if you’re not one of the rare people allergic to this precious metal.

However, iridium is almost never used for creating pure iridium jewelry (only 248 000 ounces of iridium is mined in a calendar year). Instead, it’s alloyed with platinum to create Platinum Iridium, a platinum alloy that has boosted hardness, strength, and durability compared to pure platinum while retaining the luster and simple elegance of platinum.

You’ll be allergic to Platinum Iridium if you’re allergic to iridium, as 10% within the alloy is more than enough to cause problems.

Is Iridium Bullion Hypoallergenic?

Yes, iridium bullion is hypoallergenic.

You won’t get skin dermatitis handling your pure iridium bullion provided you’re not one of rare people who’s allergic to iridium specifically.

Is Iridium More or Less Allergenic than Gold?

Iridium is less allergenic than gold.

Pure iridium and pure gold are both chemically inert and rarely cause allergic contact dermatitis. But, skin allergies arise from other metals iridium and gold are alloyed with.

Iridium is almost never alloyed with other metals given how scarce and valuable this precious metal is (only 248 000 ounces of iridium are mined in a calendar year)

Gold, however, is commonly alloyed with a whole variety of other metals producing different types of colored gold and also different gold alloys of varying purity.

For example, gold is often alloyed with nickel, palladium and silver to produce white gold. White gold made from yellow gold and palladium is hypoallergenic, but white gold made with nickel is allergenic.

Another example is rose gold where the high amount of copper within the rose gold alloy is enough to cause skin problems in people sensitive to copper.

Low purity gold alloys like 5k, 6k, 8k, 9k and 10k gold are also dangerous to people with metal allergies.

Because, even though pure gold is hypoallergenic, these alloys have too little pure gold in them, and too much other metals. And some of which are going to be problematic for people with sensitive skin.

Is Iridium More or Less Allergenic than Silver?

Iridium is less allergenic than silver.

Pure silver is rarely a cause of allergic contact dermatitis, but pure silver is too soft for most jewelry and is alloyed with other metals to increase its strength and durability. These other metals also increase silver’s allergenic properties.

For example, copper is commonly added to most silver alloys and people allergic to copper are going to be sensitive to silver alloyed with copper.

Iridium is almost never alloyed with other metals given how scarce and valuable this precious metal is (only 248 000 ounces of iridium are mined in a calendar year)

Is Iridium More or Less Allergenic than Platinum?

Iridium is more allergenic than platinum.

Both metals are hypoallergenic and extremely safe even for people with sensitive skin. However, there’s are document cases of people being allergic to solid iridium and there’re no documented cases of people being allergic to solid platinum.

That’s why platinum is a slightly better choice for people with sensitive skin.

Don’t forget that iridium and platinum are commonly alloyed to produce Platinum/Iridium, a strong and versatile jewelry alloy. Platinum/Iridium is also hypoallergenic.

Is Iridium More or Less Allergenic than Palladium?

Iridium is less allergenic than palladium.

However, allergic reactions to both metals are primarily caused by their ionic, salt-based forms, not by the pure metals themselves.

The reason why iridium is less allergenic than palladium is because palladium salts have a much higher rate of allergic sensitization in the general population compared to iridium salts.

However, both iridium and palladium are considered extremely safe in their solid forms used for jewelry design.

Is Iridium More or Less Allergenic than Ruthenium?

Iridium and ruthenium are equal in their allergenic properties.

Both metals are hypoallergenic, chemically inert and safe for nearly everyone, even for people with known metal allergies.

Read my “is ruthenium hypoallergenic” guide to learn more about ruthenium’s allergenic properties.

Is Iridium More or Less Allergenic than Osmium?

Iridium and osmium are equal in their allergenic properties.

Both metals are hypoallergenic, chemically inert and safe for nearly everyone, even for people with known metal allergies.

Osmium in solid form is perfectly safe, but powdered oxidizes and forms osmium tetroxide, a highly toxic and corrosive substance which causes severe burns and irritation to the skin, eyes, and respiratory system.

However, powdered osmium is only found in chemical labs and you’ll never encounter it in the open.

Read my “is osmium hypoallergenic” guide to learn more about osmium’s allergenic properties.

Is Iridium Hypoallergenic? Conclusion

Iridium is hypoallergenic and among the precious metals least likely to trigger allergic reactions.

However, approximately 1% of the population can still develop allergies to iridium, experiencing symptoms like contact dermatitis, asthma, and hives.

While pure iridium jewelry and bullion are hypoallergenic for most people, problems arise when iridium is alloyed with other metals, particularly in platinum-iridium alloys where even 10% iridium content can cause skin reactions in sensitive individuals.

References:

• Indium and iridium: Two rare metals with a high rate of contact sensitization- https://pubmed.ncbi.nlm.nih.gov/32248538/
• Platinum ring giving me a rash! Is the band too thick/rubbing against my pinky?- https://www.reddit.com/r/EngagementRings/comments/wb58pa/platinum_ring_giving_me_a_rash_is_the_band_too/
• Iridium jewelry- https://orchid.ganoksin.com/t/iridium-jewelry/42374/1