Apple Watch's Sapphire Crystal Display Evaluated With Diamond Tester

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Apr 12, 2001
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YouTube channel Unbox Therapy has shared a new video that tests the stainless steel Apple Watch with a basic diamond tester to determine if it actually has a sapphire crystal display like many regular mechanical watches. The video also tests the Apple Watch Sport, LG G Watch R, iPhone 6 and a Tissot watch that is verified to have a sapphire crystal display.

The results of the test confirm that the Apple Watch does have a sapphire crystal display as advertised, with the diamond tester recognizing the thermal conductivity of the scratch-resistant material. The verified Tissot watch also displays a reading on the meter, while the Apple Watch Sport, LG G Watch R and iPhone 6 do not yield any results because all three devices have traditional or ion-strengthened glass displays.

Sapphire crystal is a harder and more scratch resistant material than traditional glass, which is why Apple chose it for the more expensive Apple Watch and Apple Watch Edition display and lenses of the heart rate sensor. Apple cut the sapphire crystal with a diamond-encrusted wire to allow for a precise fit and polished it with diamond-covered pellets for a smooth and glossy finish.
"Sapphire is the second-hardest transparent substance after diamond," reads the Apple Watch materials page. "That's why we chose it to cover the Apple Watch and Apple Watch Edition faces, and to make the lenses of the heart rate sensor. Our sapphire crystal comes from the highest-quality boules. Only the purest, clearest, and strongest sapphire crystal is harvested. To ensure a precise fit for the case, the crystal is cut using a diamond-encrusted wire. To make room for an integrated antenna, a tiny groove is laser-ablated around its perimeter. And to create the smoothest possible finish, the crystal is polished with diamond-covered pellets."
Apple Watch has been put through a variety of tests since it was released last week, giving users an idea of how the wrist-worn device manages based on both normal and unrealistic usage. CNET shared an Apple Watch torture test on Friday that, among other things, involved submerging the watch in hot water and pouring ketchup and maple syrup on it, while another video took the Apple Watch into the shower and swimming pool as part of a waterproof test.

Article Link: Apple Watch's Sapphire Crystal Display Evaluated With Diamond Tester
 

DavidTheExpert

macrumors regular
Apr 20, 2012
199
349
I would have gone with the stainless steel model for the sapphire display if only there were more color options. I went with sport because I liked the space gray color better. The space black stainless steel was nice, but it only comes with the link bracelet putting the minimum price at a thousand dollars. Eff that.
 
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Patriot24

macrumors 68030
Dec 29, 2010
2,811
793
California
I think the Unbox Therapy guy is nice and knows his stuff, but my god does he take forever to get to the point in all of his videos. This one in particular could've been 30 seconds.

"Oh look, it really is Sapphire." ROLL CREDITS.
 

kdarling

macrumors P6
I don't think there was ever any doubt about Apple using real sapphire crystal displays. :confused:
No kidding! :rolleyes:

How about testing something that we don't know yet. Like:

- What's the battery size in the 42mm????

- How long does a watch go if you put it into Reserve Mode at 100% battery?

- Is there a way to fool the wrist detection and move the watch to another arm?

- Heck, what if you just put a piece of white tape (or a band-aid) under the watch? Does this allow the owner to wear it looser?

- I.e. Is the detection looking for a pulse? And if so, is that only every ten minutes?


- etc
 

darcyf

macrumors 6502a
Apr 25, 2011
522
669
Toronto, ON
"To ensure a precise fit for the case, the crystal is cut using a diamond-encrusted wire. To make room for an integrated antenna, a tiny groove is laser-ablated around its perimeter. And to create the smoothest possible finish, the crystal is polished with diamond-covered pellets."

And in the making of this watch, a lot of f***s were given.
 

lincolntran

macrumors 6502a
Jan 18, 2010
843
471
Tissot > Apple watch all day :)
https://forums.macrumors.com/attachment.php?attachmentid=546886&stc=1&d=1430233515
That depends on personal needs. I haven't wear a watch for years and now I'm loving my Apple Watch. Why? I can use the silent alarm to wake up everyday without disturbing everyone else. A mechanical watch failed in this area. Also, with an arm raised, I know the time, temperature, and date. That the 3 things I want to know at any given moment and quickly. A mechanical watch can't fulfill this need either.
 

maflynn

Moderator
Staff member
May 3, 2009
66,951
33,960
Boston
I think apple would have faced a massive class action suit and lost a lot of respect/good will if it wasn't. Its really a no brainer that they used it.
 

masotime

macrumors 68020
Jun 24, 2012
2,351
1,901
San Jose, CA
I don't know about you guys, but I'm getting real tired about hearing about the Apple watch.

Especially since I ordered it a few minutes after online launch and I still don't know when I'm going to get it :mad:
 

Aluminum213

macrumors 68040
Mar 16, 2012
3,522
3,911
I think the Unbox Therapy guy is nice and knows his stuff, but my god does he take forever to get to the point in all of his videos. This one in particular could've been 30 seconds.

"Oh look, it really is Sapphire." ROLL CREDITS.
His old videos were straight to point, the more popular he's become the videos are more long winded, over produced and excruciating to watch


But who thought Apple was lying? What a pointless video
 

HenryDJP

Suspended
Nov 25, 2012
5,084
843
United States
I think the Unbox Therapy guy is nice and knows his stuff, but my god does he take forever to get to the point in all of his videos. This one in particular could've been 30 seconds.

"Oh look, it really is Sapphire." ROLL CREDITS.
I have no respect for him or his videos whatsoever.
 

tarkeybear

macrumors member
Mar 2, 2006
83
41
Claremont CA
Breaking the wrist (connection)

No kidding! :rolleyes:

How about testing something that we don't know yet. Like:

- What's the battery size in the 42mm????

- How long does a watch go if you put it into Reserve Mode at 100% battery?

- Is there a way to fool the wrist detection and move the watch to another arm?

- Heck, what if you just put a piece of white tape (or a band-aid) under the watch? Does this allow the owner to wear it looser?

- I.e. Is the detection looking for a pulse? And if so, is that only every ten minutes?


- etc
You can slide the phone quickly from one wrist to another and it will read pulses (and presumably allow for Apple Pay). This has to be done quickly, wrist to wrist.

If you remove the watch from the wrist, it quickly detects the removal (might be a light sensor) and immediately goes to secure mode, requiring your passcode if you want to do anything else but read the time.
 
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