Yes it can and has been done. There are many variables that has to fall into place like the spinning coin must be face on to the bullet at the time of impact, the coin must be thin enough for the particular bullet (speed, calibre etc) to penetrate it.

Diamonds will burn at about 1562°F (850°C). House fires and jewelers’ torches can reach that temperature. A house fire caused the white, cloudy appearance of this diamond (left). The stone was recut to remove the burned area, reducing the diamond’s size, but leaving no sign that it was ever damaged (right).

A strong object; like a hammer! a hammer can break a diamond easily. Diamonds are hard, they are known to be the hardest material on the earth but they have a crystal structure, so they can break if you hit them with the right angle!

Aluminum armor can deflect the same rounds from small-caliber weapons as traditional bulletproof glass, but it will still be more clearly transparent even after being shot. Aluminum armor can stop it in half the distance and yet is half the weight and thickness of traditional transparent armor.

Instead of high-cost Kevlar vests, researchers have discovered that armour made from traditional Thai silk offers similar levels of protection. Tests show that a speeding 9mm bullet can be stopped dead by just 16 thin layers of silk. Use of silk to protect against injury is not a new development.

A report from February 2012 says an iPhone sufficiently slowed a bullet to stop it reaching the owner’s heart. Although it does seem the bullet had already smashed through a car’s windshield first, which likely helped stop it.

The US Army cannot enlist enough spiders to provide the silk it needs to make stronger bullet-proof vests. These vests are currently made of Kevlar. But spider silk is stronger than Kevlar, even if it is less readily available.

By doing it differently from the way silkworms do it—by changing the way silk protein is processed from water—they could also create new transparent materials of natural protein that could be molded into tiny needles that cause no irritation to the skin; flexible and biodegradable implantable electronics that record …

Mulberry silk is the finest and soft silk which is the most expensive silk fabric in the world! Even Cashmere silk and vucana silk are famous for their quality.

The Mongols used silk under their armor to help stop arrows. Silk is a very strong fiber and if weaved properly could stop an arrow. A properly made silk bullet proof vest was worn during WWI.

Bullet-resistant materials (also called ballistic materials or, equivalently, anti-ballistic materials) are usually rigid, but may be supple. They may be complex, such as Kevlar, UHMWPE, Lexan, or carbon fiber composite materials, or basic and simple, such as steel or titanium.

There are various ways to make bullet-resistant glass, but essentially, it is made by layering a piece of special polycarbonate between pieces of ordinary glass. This process is called lamination. As the bullet-resistant glass gets thicker, it also gets stronger. The thickness can range anywhere from 7mm to 76mm.

Perhaps one of the better-known bulletproof materials, Kevlar is a synthetic fiber that’s heat resistant and incredibly strong. It’s also lightweight, making it a popular choice for wearable bulletproof items. Kevlar is used in both military and civilian applications.