Ads
related to: are najarda pearls real
Search results
Results From The WOW.Com Content Network
Majorica imitation pearls are man-made on solid balls, likely made of glass, that are coated with a proprietary coating that is made in part from fish scales. [1] The coated nuclei are then dried and polished, and then dipped in a chemical (possibly cellulose acetate and cellulose nitrate) to harden the surface and guard against discoloration, chipping, and peeling.
Roman pearl is an alabaster core coated with a pearlescent material. [1] Shell pearl. Cut, buffed, and sometimes dyed nacreous portions of mollusk shells: Variations and alternate names include cat's-eye pearl, coque de perle (from nautilus shells), mother-of-pearl pearl (from mother-of-pearl), and hinge pearl (from the hinge of bivalve shells ...
A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as a conulariid.Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) [1] in minute crystalline form, which has been deposited in concentric layers.
Medieval gem engraving only recaptured the full skills of classical gem engravers at the end of the period, but simpler inscriptions and motifs were sometimes added earlier. Pearls gathered in the wild from the Holarctic freshwater pearl mussel were much used, with Scotland a major source; this species is now endangered in most areas. [13]
Assorted keshi pearls. Keshi pearls are small non-nucleated pearls typically formed as by-products of pearl cultivation. A Japanese word also meaning "poppy" (ケシ, 芥子), it is used in Japanese for all pearls that grew without a nucleus. Originally, keshi pearls referred to those pearls formed when a bead nucleus was rejected.
Pearls are irradiated to produce gray blue or gray-to-black colors. [24] Methods of using a cobalt-60 gamma ray facility to darken white Akoya pearls were patented in the early-1960s. [31] But the gamma ray treatment does not alter the color of the pearl's nacre, therefore is not effective if the pearl has a thick or non-transparent nacre. [31]