There are a number of bacteria that DO survive in harsh environments be it pH or temperature extremes or an environment that is very salty. Bacteria that don't survive in hars â¦ h conditions usually lose cell wall integrity and break apart, or lose all their intercellular fluid and shrivel up.
Akoya Pearls are the Classic Pearl Variety. The akoya pearl is a saltwater cultured pearl from the akoya oyster (Pinctada fucata martensii). Because akoya are the most abundant type of saltwater pearl with the longest cultured history, information on akoyas is abundant!
The sizes of cultured Akoya pearls range from 2 to 10mm. The larger the pearl, the rarer and more valuable it is. The average size of pearl necklaces sold today is 6.5-7mm, 7-7.5mm, and 7.5-8mm. 6-6.5mm pearl necklace: Ideal for young or petite women.-7.5mm pearl necklace: It is about the central size for Akoya pearls. 7-7.5mm is the most popular among all sizes of pearls. Appropriate for most women. Ideal for weddings, birthdays, anniversaries, Mother's Day presents, college graduations, and Valentine's Day gifts.