LADIES,IM NO EXPERT,BUT I HAVE FOUND  A FEW THINGS OUT THAT CAN HELP YOU TAKE CARE OF YOUR JEWELRY-.ONE THING MOST PEOPLE DONT KNOW IS SENDING JEWELRY THROUGH THE MAIL CAN CHANGE COLORS IN STONES,ESPECIALLY IN OPALS,MOONSTONES,ALEXANDRITES.-LET THEM REST A DAY OR TWO AND GET THEM INTO SUNLIGHT THEN,SOMETOMES PEARLS NEED ATTENTION ,LOSE COLOR,FADE,TRY A CUE-TIP IN OIL,,PEARLS NEED MOISTURE AND TEND TO CHANGE WITHOUT IT,ANOTHER THING,  I HEAR OFTEN IS ,TECHNIBOND IS SUPPOSE TO BE SO GOOD,BEING 18K GOLD OVER STERLING AND MINE TURNED ORANGE !!! WELL,9 OUT OF 10 TIMES,YOU DUNKED YOUR HAND IN CLOROX WATER OR SOME STRONG CLENSERS,PLEASE TAKE OFF JEWELY AROUND EVEN SOAPS,CHEMICALS IN TODAYS WORLD DO FUNNY THINGS,,THEN OF COURSE I HEAR ALL KINDS OF COMPLAINTS ON SILVER,IT TURNED BLACK,ETC.,COME ON LADIES,SILVER HAS ALWAYS DONE THAT FORM OUR GREAT GRANDMOTHERS POLISHING THEIR SILVER TO TODAY WITH OUR RINGS,IT'S CALLED OXIDATION,TRY TO KEEP IT IN A NEWER JEWELRY BOX FOR ANTI TARNISH, OR PLASTIC,AND I AM HEAR TO TELL YOU,ORDER A SILVER CLOTH AND POLISH,SILVER IS SO BEAUTIFUL,LASTS A LIFETIME AND IS WORTH ALL THE MINOR TROUBLE YOU WILL HAVE.,NOW ON SEMI-PRECIOUS STONES,DONT SAY THEY LOOK CLOUDY,AND DONT  TELL ME THEY DONT SPARKLE ANYMORE,MANUFACTURERS  LEAVE AN OPENING UNDER A STONE TO COLLECT LIGHT AND HELP IT TO SPARKLE,BUT THIS HOLE ALSO GATHERS OIL,DUST,ETC.,WHEN IT DOESNT SHINE,TAKE IT TO THE BATHROOM AND USE A BABY TOOTHBRUSH AND BRUSH IT'S TEETH WITH TOOTHPASTE AND BRUSH IT CLEAN WITH WATER AND DRY IT VERY WELL,AND I GUARANTEE YOU ,IT WILL LOOK JUST LIKE NEW.