Is it sapphire? USE YOUR HEAD! Watch and Learn #82 

Next time on Long Island Watch: "How to taste which type of steel your watch is made of"

Puts on forehead: This one has a sapphire crystal. Holds next watch to ear: This one has an ETA movement. Eyes start bleeding when he looks at it: This one is an Invicta.

Me doing this trick to see if the watch really has a sapphire crystal. Everyone else at the Rolex AD: 👁👄👁

I put it against the most sensitive part of my body and now have a life ban from my local jeweller.

IT WORKS!!! and I've just joined thousands of people around the world sitting with a watch on their head, and we're all smiling cheers Marc...stay safe

Me: "This is my crystal tester" Watch merchant: "THAT'S NUTS!" 🤣🤣🤣

This is a valid, legitimately good advice; however this also has immense meme potential :)

The advantage to using another sensitive of your anatomy is, if you don't get punched, you might get to keep the watch.

Thanks for addressing this issue head on!

You mentioned that the thermal conductivity of sapphire is very high, so it makes sense that it would feel 'cold' when you put it against your skin. I always enjoy teaching my students that cold does not actually exist, only variations in heat do. When we experience what we call 'cold', it means that whatever is touching our skin has less heat than our skin does. Nature is always attempting to reach heat equilibrium, so heat always travels from areas of higher heat to areas of lower heat. That temperature movement is what we call 'cold'. Sorry for nerding out there!

That's it. Marc lost it. Edit : nevermind, it works.

So this is why diamonds are called ice

The collective sound of watch geeks everywhere running to their watch box and saying out loud, “OMG. That is SO weird!”

Fun video, and it works! I was able to distinguish between different crystals all over my bald head.

“Hold the watch crystal to a sensitive part of your body” ....yep my mind went there, too. 😂

Just came across your channel recently. Having become a Seiko enthusiast, learning more about how they work and timepieces in general has been extremely easy and enjoyable thanks to your channel. I’ve had my eye on the ISL 09 for awhile and I’m looking at the cherry blossom one for my gf. Only a few others besides Seiko has really grabbed my attention for the price point, but because of your due diligence and authenticity I want to have a few Islanders in my collection. Wish you the best bro 🤙🏼

Outstanding advice. It works !!

Awesome! Thanks for sharing.

OMG...just tried this...and it works!!! My mind is blown!!! Thanks Mark!!!

Fantastic, thanks Marc!

lmao I've tried this now and it actually works. Sapphire is like an ice cube, whereas mineral is just kinda cool

Great tip Marc, thanks! Will test my cheap Chinese auto that I got specifically for the sapphire crystal it supposedly has. Tested against a G Shock DW5600E, and my cheap Chinese does indeed have a sapphire crystal :)

Wow this works incredibly well. A regular mineral glass feels like it just came out of a fridge, while a sapphire glass feels like it came out of the freezer.

Very clever! Thank you!

great tip. Thank you Mark

Very cool! Thanks for sharing that Marc! Who would have thunk it? 😱 👍🏻👍🏻🇺🇸

Subscribed immediately the channel after putting my Casio Oceanus and another casio on my forehead...Pure Genius! Thank you

That's a fun trick! I checked with the back of my hand so I didn't have to take them out of the box and it worked pretty well. On a slightly related note, I have a lot of acrylic crystals in my collection!

Really cool. Thanks.

Very cool Marc! Thanks for sharing this.

It actually works! Thanks Mark!

Awesome!!! Thanks

The comments are SO funny! Great job Marc

Good to know Thanks.

Super trick. Thanks.

Very interesting demonstration Marc! Your videos never disappoint. thanks for sharing…Ed

That is a true watch n learn. Thanks

That’s awesome! 👍🏼 Cool little tidbit.

Great video. Also recommend checking temperature with back of your hands. Lots of thermosensitive nerve endings there, which is why some medical professionals feel for a patient's temperature by using the back of their hands on a patient's forehead or limbs

Brilliant. Thank you =)

Love the watch and learns!

Unreal. Was just going to start polishing glass crystal with diamond paste today, and have the hardest time figuring out what some of the crystals are made of due to the watches being so small, and all previous advice didn't really help me. This did. The Universe in action...ask and thy shall receive. Thank you Marc. You Rock

Insane that this works. Wow! Thanks for tip!!

Thank you

I tried it out! This is amazing!!

Interesting! It actually works. Waterdrop test does work as well, but not on all watches.

Super cool, just tried it, I knew one was not sapphire, and thought the other one was.... holy cow a big difference. Thanks for this, Mark, really cool.

I’m off to try my watches. Thanks Mark

Cool trick. Love that new robins egg blue watch you have released 👍🏴󠁧󠁢󠁳󠁣󠁴󠁿

Cool suggestion! I'll try it

That really is a cool trick. Thanks.

You know what, at first reading this comments I started laughing but as you explained made sense. Odd way to check but if you don't have the tools to check on spot this can help heck of a lot. It will definitely not be my first choice of checking the crystal but definitely helpful. Thanks Marc.

feel and learn. great video! many thanks.

Brilliant!..

Be honest. How many of you just grab a couple of watches, and put them on your forehear? 😄 I know I did 😂

What a killer idea!!!

Awesome!! I had to try it 👍

Great.. I will try this one. Tq ❤️

This was amazing!!!

Thanks for the tip! I have a mineral crystal and 2 sapphire crystal watches. Very definite difference in temperature between sapphire and mineral👍

All the watches you had in this video are gorgeous!!! Nice tip btw!

Just tested a couple of mineral crystals and one sapphire. Cold, cold, and icey.

Quartz straight out of the ground is also cold even if you find in the summer. Cool ingenious demonstration

Very cool Marc trying now with ISL-62 and Seiko Monster! Love your watch chest drawers 🥰🥰🥰🥰👊

Nice trick! Good job mate, thanks!

This is great!

That Wenger looks beautiful. Thanks for the DIY test; literally, no tools. I really don't understand what's the deal with 'sapphire coated glass'. They look (distortion) like sapphire but not sure if they are scratch resistant enough. Now Iam going to forehead test all the available type of crystals.

Very cool!

I tried it and it works....................great trick Marc, thank you !

This actually makes a lot of sense!

Always great content. Every single time.

I learned this trick from you, Marc: Wipe the crystal off, and put a small drop of water onto the crystal and tilt it: if it spreads easily and without issue, it's mineral glass, if it stays in one, big, round drop, and rolls with resistance, then it's sapphire 😉

Love that Wenger!

I really like watch and learn… thanks 🙏

This is super cool!

Good one! It works.

Awesome info👍🏻

Great tip! Mineral is initially cold but warms quickly and stays warm, Sapphire stays ice cold

Greetings from The Netherlands. That crystal test is wild. I have two Citizen Eco-Drive watches on a windowsill charging. One has a standard mineral glass crystal and the other, is a sapphire crystal. Both watches are at room temperature for the test. The mineral crystal was just cool feeling. However, the sapphire crystal felt arctic cold against my forehead. As I said, this test is wild. Many thanks for the tip.

'Thanks for watching' :-) Thanks for the video. Neat trick.

Elementary, my dear Watson! Sometimes people are in doubt if something is metal or plastic. Just touch it, and you will know. Same principle here. Thanks for showing how easy this is!

Thanks Mark, that's really cool trick

Woah! Great trick Mark!

Hey it’s works!! Thanks😎

Tried it with a dressKX and sarb, and wow it works! Neat!

This is a clever strategy!

I've been reviewing your watch and learn series. I don't know if you have ever gone into the details of what makes a mechanical watch tick--literally. That is, what parts actually come into contact and thus create the sound of ticking. It seems to involve several parts from what I have been able to research. Could you explain it in a watch and learn, looking at the parts in a movement that make the sound(s) of ticking? The watch and learn series is awesome. I have learned a lot. Please keep it going!

Ha pretty cool, thanks!

Good advice, I tried it and you are right, on your forehead skin, saphire crystal is feel way more colder than acrylic

This is gold! I love it! 😂

Marc! It works! Thanks for solving a nagging puzzle. My Save the Ocean, Prospex Samarai, with Hardlex crystal is warmer than the crystal on my green Sumo prospex .So the later specifications are right. It's a sapphire crystal! But I initially didn't believe that when I bought it because there's no reference to a sapphire crystal on the caseback or documents. A very happy chappy here .Cheers Marc.😄

Wow, that is one cool trick! Will definitely try it!

Cool trick! I'll have to try that out!

Cool vid thanks.😎

Thanks for charing this 👍

Why do I think of the great Carnac (from The Johnny Carson show) when you hold the watch to your head?

On a Sensitive Part...🤣 Great clip

Great video Marc! ⏳

Fun one!

Simple… easy but not fool proof.. very cool little tip!