Place your jewelry in a clean mason jar or another suitable container. Cover it with white vinegar, so that it is completely immersed. You can let it sit for two or three hours, depending on how much tarnish you need to remove. Then, rinse and dry the jewelry. If the piece is only moderately dirty, it should be pretty clean after fifteen minutes.
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One-sentence summary -- Immerse your jewelry in white vinegar.

The safest and most comfortable position for a massage is for your wife to lie on her side with pillows below her head and belly for support. That will help prevent strain on her uterine ligaments. You can also place a pillow between her knees to help cushion her legs and hips, and she may be more comfortable if her knees are bent and slightly drawn up toward her chest. Allow your wife to determine her comfort level, and help her make any adjustments to the pillows or her position if she needs them. Your wife shouldn't lie on her back, especially after her fourth month of pregnancy. This can create pressure on major blood vessels that can lower your wife's blood pressure and cause decreased blood supply to the baby. A semi-reclining position can also be effective for massage. For instance, you may place a pillow against your belly, then have your wife lean into you so her back is against the pillow. She can also rest her head against your chest, especially if you're just massaging her neck and scalp. However, if you're massaging her shoulders and back, she'll probably need to lean forward slightly. Your wife might also try kneeling on the floor facing the bed. She can then rest her arms on the bed to support herself, if that's comfortable for her. Cup your hand around one of your wife's shoulders where it meets her neck, then slide your hand up to the base of her skull. Slide your hand back down to the outside of her shoulder. Use the base of your hand or the pads of your fingers to gently apply pressure anywhere the muscles feel tight. When you're finished, repeat on the other side. This is a good massage to do when your wife is sitting down. You can also run your hands up and down the outside of her arms as you do this. Try walking your thumbs up and down her neck on either side of her spine, especially near the base of her skull and where her neck and shoulders meet. While your wife is lying on her side, rub your palms along her back on either side of her spine. Pay attention to any areas that feel especially tight, then gently knead those areas with the base of your hands or your thumbs, working up and down her back. You can also gently press in with your fists along her lower back. As your wife's belly grows, it will create a lot of new pressure which can lead to back pain, especially at the end of a long day. Avoid massaging along her sides, as pressure in those areas can tickle or hurt. Cup both hands around your wife's head, just behind her ears. Gently move your hands in a circular motion, either in the same direction or in opposite directions. Work your hands up toward her hairline and down toward her neck. You can also use your fingertips to apply gentle pressure to her scalp. When the rest of your wife's body is feeling bulky and uncomfortable, a scalp massage can be a surprisingly soothing experience, and it can be a great way for you to be affectionate with her. A pregnant woman's legs and feet can often get sore and swollen, especially late in pregnancy. Use your flat palm to massage up and down her legs, and rub the top and bottom of her foot with your whole hand, all the way up to her ankles. Then, use your thumbs to make gentle circles near her ankles, heels, and the balls of her feet. You can also gently pull on each of her toes, or you can rub between her toes with your fingers. Avoid putting any pressure between your wife's heel and ankle bone. This area contains a pressure point that may stimulate contractions.
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One-sentence summary --
Have your wife lie on her side supported by pillows. Massage your wife's shoulders and neck to relieve stress-related tension. Rub and knead your wife's back to ease her sore muscles. Help your wife relax with a loving scalp massage. Rub your wife's legs and feet to help relieve pain and swelling.