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Sea Treasures - Hyriopsis Cumingii $5 2 real PEARLS convex hologram .999 pure silver coin set.
With the fourth issue there is something new! The mintage is split into 1500 pieces in pure silver and 500 pieces pure silver gilded making a premium product available with both coins together in a set. Fourth coin in award winning series this amazing set will be delivered with premium box.
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|Face Value :||5 Dollars (x2)|
|Metal :||.999 Fine silver|
|Weight :||25 g (x2)|
|Size :||38 x 30 mm|
|Mintage :||Only 500 sets worldwide|
|Series :||Sea Treasures|
|Certificate of Authenticity :||Yes|
|Original ETUI box/case :||Yes|
Hyriopsis cumingii: this species is recorded from China (Hebei, Shandong, Anhui, Jiangsu, Zhejiang, Jiangxi, Hubei and Hunan provinces) and from northern Vietnam.
It is found in lakes and rivers living in muddy substrate. It is breed in artificial pools for pearl aquaculture. It has a complex life cycle involving a larval stage (glocidium) which can only survive in specific species of host fish.
It is the most important species of freshwater mussel for pearl culture in China. It is also used as food for humans, poultry, livestock and fish. Its shell is used in traditional Chinese medicine and handicrafts.
This species is facing serious population decline and local extinction throughout its range due to overexploitation and impacts on water quality. It also faces threats from damming, dredging and declines in host species of fish.
A pearl is a hard object produced within the soft tissue (specifically the mantle) of a living shelled mollusk. Just like the shell of a clam, a pearl is made up of calcium carbonate in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes of pearls (baroque pearls) occur. The finest quality natural pearls have been highly valued as gemstones and objects of beauty for many centuries, and because of this, the word pearl has become a metaphor for something very rare, fine, admirable, and valuable.
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