Page 85 - Thailand Gems & Jewelry Guide Book English_China Version

Thailand’s Gems & Jewelry Guide Book
85

• When you have your pearls restrung. make sure they

are knotted between each pearl. This will prevent the loss of

pearls if the string should break.

• Replace broken or scratched watch crystals promptly,

even the smallest crack can let in dust or moisture that can

threaten its accuracy.

• Pearls, coral and porous stones such as opal, turquoise

and malachite should be kept away from oils, chemicals and dirty

water to avoid discoloration. Wipe them gently with a soft, damp

cloth.

• Ultrasonic cleaners should not be used with stones

subject to internal stress such as tanzanite, opal, emerald, organic

gems (pearl, coral and amber), turquoise, lapis, malachite and

any stones containing major inclusions.

• Opal, pearls, coral, amber and turquoise are heat

sensitive (both to extreme and sudden changes in temperature).

Do not leave them in hot sunlight, near radiators, or in hot cars.