In one sentence, describe what the following article is about: Like any stone, yellow sapphire occasionally contains inclusions and negative space inside the stone. When a gem-cutter slices into one of these imperfections, a small hole can develop. Most jewelers prefer to keep the hole in the gem rather than cut it away, but untrustworthy jewelers sometimes fill the stone with glass or borax paste to add weight and make the stone appear higher quality. Examine the stone by shining a light on it. Patches of unevenness are usually a good indication of this practice. Foil backing reflects more light, making the color of the yellow sapphire look more vibrant and the luster of the gem look brighter. The backing can be hard to see if the stone is already fitted into a setting, but careful examination of the base of the stone under magnification can often reveal a foil backing. Moreover, this potential falsification is more commonly found in antique jewelry, meaning that you may not need to worry about it quite as much if purchasing a new piece. If you have any doubts about the seller you plan to buy from, consider buying loose stones or stones with settings that give you a look at the bottom of the stone. Claw, tension, and channel settings are good examples. On the other hand, closed settings, like the bezel mounting, are often used by scammers to hide flaws and evidence of fraudulence. True yellow sapphire is a pure yellow, but similar, less precious imitations often have slightly different hues. Citrine has a slight green tint, golden topaz has strong traces of orange, and yellow tourmaline has a brighter, lemon-like hue. While a certificate does not give you the same assurance that physically checking the stone might, it does provide you with the satisfaction of knowing that the stone was checked and approved by an official, trusted organization. Look for certificates from national gem societies like the Gemological Institute of America or the American Gem Society.
Summary: Watch out for fillings. Be aware of foil backed stones. Keep setting in mind. Note the color. Look for a certificate.

In one sentence, describe what the following article is about: Some rabbits enjoy shredding fabric, while others simply enjoy bunching and "sorting" fabrics. An old hand towel or a couple of washcloths would allow your rabbit to bunch and tear as much as he likes. Just be sure that your rabbit doesn't eat the fabric, as it could make him sick or create a choking hazard. Once you've removed the front and back covers of a phone book, your rabbit can shred, bunch, and sort scraps of paper from the phone book. Rabbits should only play with phone books under close adult supervision, however, as you'll want to be sure your pet doesn't eat any of the adhesives along the spine of the phone book. The tube inside a roll of paper towel or toilet paper can make an excellent toy for rabbits to shred. It's soft enough that it will be easy to tear, yet thick enough that it will provide some resistance. For even better results, stuff a cardboard tube with hay or shredded paper and hide treats in the middle. Your rabbit will shred and tear, and will eventually find a reward inside!
Summary: Give your rabbit an old hand towel. Let your rabbit tear up an old phone book. Make a toy out of a cardboard tube.

In one sentence, describe what the following article is about: When communicating with a deaf person, try to keep your eyes at the same level as their eyes. You can sit down if they are sitting, or stand up if they are standing. You should be a little further away than the normal speaking distance (3-6 feet, 1-2 meters). This helps to make sure they'll see all of your gestures. If you're indoors, make sure there's enough light for them to see you clearly. If you're outside, face the sun so that there isn't a shadow cast in your face and the sun doesn't glare in theirs. Avoid placing anything in or around your mouth (chewing gum, your hands) while you are talking. As best you can, try to speak normally. Whispering or shouting will can distort your lip movements, making it difficult for a deaf person to follow your words. Similarly, if you exaggerate your mouth movements, you will be harder to understand than if you speak normally. Increase the volume of your voice only helps if the person asks you to do so. Speak a bit slower if the person asks you to do so. Your eyes and facial expression help to communicate the tone and demeanor of your conversation, so it is important to maintain eye contact. Do your best not to turn your head away while you are speaking. Also, try and make sure they are maintaining eye contact. For example, if you're teaching them how to use an object and they are looking at the object, wait for them to be done looking at it before you continue. If you have sunglasses on, take them off. If you can add facial expressions to emphasize a point (smiling, rolling your eyes, raising your eyebrows) do so, where appropriate. It can be helpful to incorporate some physical movement or props into your communication. You might point to (pointing is generally not considered rude in the deaf community) or hold up any items that you're talking about, or mimic actions (like drinking or jumping or eating) to help illustrate your words. You can hold up fingers to indicate numbers, scribble in the air to show you're writing a letter, and so on.
Summary:
Stay in their field of vision. Speak in a normal voice and tone. Maintain eye contact. Use gestures and visual cues.