Omega uses the plastic/acrylic crystal because it is shatterproof. While sapphire is scratchproof (virtually), it isn't safe at very intense pressure levels. An astronaute would have a very HUGE problem if his sapphire crystal shattered at 0 G. That's why it's used on the Speedmaster Pro and not on the regular Speedmaster's, it's intent is to be a professional Pilot/Astronaute's watch, in that respect it does its job admirably, IMO.

No, Plastic and Sapphire Crystals cannot be interchanged. The cases are different for each and thus they cannot accomodate a different crystal type. See similar questions...

A sapphire crystal is a watch crystal which has a hardness of 9 moths. It is extremely hard and scratch resistant and can only be scratched by a diamond. However, any hit against the break point of the crystal will cause damage to it. See similar questions...

Yes all our watches have real sapphire crystal. Don't be fool by ordinary glass or plastic glass. A good replica WILL HAVE THIS. If it doesn't, it's not worth the money. Is the watch full solid stainless steel? Yes, all our watches are full solid stainless steel. This is very important as cheap steel will deteriorate over time. If a replica is light weight that's a dead give away that it is not solid steel. Our watches have the weight of sturdy, quality steel. See similar questions...

If the watch originally came with a plastic crystal, you cannot install a sapphire crystal. The cases are made slightly different and if you attempt to put a sapphire crystal on an older watch, the hands will touch the crystal and cause the watch to stop. Please beware! Some companies claim that they can interchange them, however, you are at risk of the watch no longer being water resistant and the use of non-genuine Rolex Parts. See similar questions...

Not quite. Another sapphire or ruby will scratch it. Also remember that scratch-proof is not shatter-proof. A sapphire crystal is remarkably durable, but far from impervious. It's best to treat a quality watch like any other piece of finely-crafted jewelry. See similar questions...

Sapphire is an anisotropic, rhombohedral crystal, and therefore non-uniformly dimensioned. Anisotropic materials exhibit some properties such as thermal expansion uniquely to orientation. For most applications this is unimportant, however should be considered. Sapphire is “birefringent” which is a refractive feature that offsets wave transmission up to 0.8% at right angles to the optic axis. Birefringence is eliminated along the optic or C-axis. See similar questions...

A watch crystal may be scratch-resistant, however no crystal is truly scratch-proof. Therefore, please follow these steps when handling your watch: Avoid dropping the watch in a drawer or jewelry box, to prevent it from being scratched by coming in contact with other pieces of jewelry. Avoid wearing your watch during high-risk activities, when lifting or moving heavy objects, or while engaging in sports activities Avoid wearing your watch on the same wrist as another piece of jewelry. See similar questions...

Sapphire is the birthstone for September. Though sapphires occur in a variety of colors, blue is by far the most popular. In fact, the ancient foundations of the word "sapphire" translate to "blue stone" in several languages. Sapphires are mined in various places around the globe, including deposits in Thailand and in the state of Montana. Sapphires have a striking luster due to their hardness, rated as a 9 on the Mohs hardness scale. See similar questions...

The c.321 is the movement most sought after by collectors because it was the original Speedmaster movement, was the movement used in the first watch worn on the moon as best as anyone has been able to determine. The c.861 and it's variants (c.863, c.1861, c.1863, etc) have their adherants as well. See similar questions...

It seems a lot of places on ther Internet say Gender or Time - however, it's been proven that this is definitely wrong. Wurmple's evolution is determined by hidden value, so it's basically random as to whether you get a Silcoon or a Cascoon. See similar questions...

How do I clean my beautiful gemstones such as, garnet, amethyst, aquamarine, peridot, citrine, etc.? Thank you, Patti i lost my certificate for my diamond i bought at ben bridge jewelers. it was an ags certificate #6342401. how can i get a copy of that. thank you, chuck jacobson Is there a way one can estimate the carat weight of a gem if one knows the gem's dimensions? Thank you. I currently own and AGS certified diamond (AGS0003232310) and I'm looking to upgrade to a new diamond. See similar questions...

Crystal glass is glass that is specially made to contain a high amount of lead and lead oxide. This kind of glass is heavier and more brilliant than regular glass due to the high lead content. See the Wikipedia entry on crystal glass. See similar questions...

The clear cover over the watch face is called the crystal. Three types of crystals are commonly found in watches: Acrylic crystal is an inexpensive plastic that allows shallow scratches to be buffed out. Mineral crystal is composed of several elements that are heat-treated to create an unusual hardness that aids in resisting scratches. Sapphire crystal is the most expensive and durable, approximately three times harder than mineral crystals and 20 times harder than acrylic crystals. See similar questions...

The material has to be processed. The gravel dug from the Spokane Bar is 20 feet deep. We must remove 15 plus feet of overburden then dig the remaining gravel down as deep into the bedrock as possible. Then we haul it out of the pit with dump trucks and stockpile the gravel. Our trommel is started, pumping water over 100 feet up from the lake. The gravel gets sorted through the trommel, taking out the boulders, sand and sizing the material. It then goes into another machine, called a jig. See similar questions...

Call 1-800-367-2437 or visit AIDSHotline.org for a referral to a community group near you that provides more information or services for gay and other men who have sex with men who use methamphetamine. See similar questions...

Mist or veils in a quartz point is caused by trapped air or water molecules, therefore it is unlikely that exposure to heat caused your crystal to become cloudy. However, over using the piece energetically can cause a crystal to become cloudy. Planes are internal fractures and are the source of amazing rainbows within a crystal. See similar questions...