The materials which are repelled by a magnet such as zinc. mercury, lead, sulfur, copper, silver, bismuth, wood etc., are known as diamagnetic materials. Their permeability is slightly less than one. For example the relative permeability of bismuth is 0.00083, copper is 0.000005 and wood is 0.9999995.
Diamagnetic materials are repelled by both poles of a magnet—you saw this in the movement of the grape. In diamagnetic materials, all the electrons pair with electrons of opposite spin. Examples of materials in which all the electrons are paired include helium, bismuth, graphite, and water.
Magnets attract, or pull, objects made with iron.
Paper clips, scissors, screws, nuts, and bolts are just a few common everyday objects that are magnetic. A magnet will not attract paper, rubber, wood, or plastic.
Non-magnetic metals include aluminum, copper, lead, tin, titanium, zinc, and alloys such as brass and bronze.
Metals That Don't Attract Magnets
Certain metals in their natural states such as aluminium, copper, brass, lead gold, and silver don't attract magnets due to the fact they are weak metals.
Steel contains iron, so a steel paperclip will be attracted to a magnet too. Most other metals, for example aluminium, copper and gold, are NOT magnetic. Two metals that aren't magnetic are gold and silver. They are often used for making jewellery, like crowns.
What to do: Hold the magnet up to the gold. If it's real gold it will not stick to the magnet. (Fun fact: Real gold is not magnetic.) Fake gold, on the other hand, will stick to the magnet.
The most common metals used for permanent magnets are iron, nickel, cobalt and some alloys of rare earth metals.
An electric bulb, however, has no need for a magnet.
Metals That Don't Attract Magnets
In their natural states, metals such as aluminum, brass, copper, gold, lead and silver don't attract magnets because they are weak or non-magnetic metals. However, you can add properties such as iron or steel to the weak metals to make them stronger.
Silver is not magnetic, not even with the strongest magnet. However, silver is diamagnetic. If you hold a silver coin at 45 degrees a suitable magnet will slide down it slowly. This is because the moving magnet sets up an 'electrical field'* that slows its fall.
In contrast to the attractive force between two objects with opposite charges, two objects that are of like charge will repel each other. That is, a positively charged object will exert a repulsive force upon a second positively charged object.
Only one mineral, Bismuth, is diamagnetic, meaning it is repelled from magnetic fields. Another property, which is unnamed, is attraction to magnetic fields when heated.
Many common metals such as aluminum, copper, brass, gold, silver, titanium, tungsten, and lead are not ferromagnetic. They cannot be made into magnets and will not be attracted to magnetic fields.
Examples of magnetic substances include iron, nickel, cobalt, stainless steel, and many rare earth metals. Diamagnetic materials like copper and gold are weakly repelled by a magnetic field. Paramagnetic materials like calcium and aluminum are weakly attracted by a magnetic field.
Iron, steel, tin and aluminum are paramagnetic materials -- so regardless of the composition of your "tin" can, it will be attracted to a magnet.
Natural Diamonds are magnetically inert (diamagnetic). They can be imitated by natural Zircon, and by many man-made materials such as Moissanite, Strontium Titanate and synthetic Rutile (all diamagnetic).
Will gold of different karats stick to a magnet? Gold jewelry, such as 18k gold, 14k gold, 10k gold, and even white gold can be magnetic depending on the alloys, or metals combined with gold, used.
Rubber, plastic, stainless steel, feather, paper, mica, gold, silver, leather, and other non-magnetic materials are examples.
Aluminium, on the other hand, is quite different. While it's not far behind in terms of conductivity, it is not attracted to magnets as iron is.
Most bullets aren't ferromagnetic – they aren't attracted to magnets. Bullets are usually made of lead, maybe with a copper jacket around them, neither of which sticks to a magnet. These magnets made a bullet tumble on Mythbusters, but didn't change where it hit the target.