Blister natural pearl

5.22. Blister natural pearl South sea pearls wholesale a natural pearl (5.118) that has perforated the mantle of the mollusc and has naturally adhered, through layers of nacreous or non-nacreous secretions applied by the mollusc, to the inner wall of the shell. The subsequently formed layers of nacreous or non-nacreous material are continuous with those of the inner wall of the shell. They are round or irregular in shape and are secreted without human intervention (Scarratt 2001). Blister pearls are known in the Arabian Gulf as "Nimro". The base of natural blister pearls may be worked (5.185). 5.23. Body colour the dominant, overall colour of the natural or cultured pearl. 5.24. Bombay Bunches strands of round salt water natural seed pearls (ranging from less than 1 mm to 3 mm)(5.159), mostly with medium to high lustre and well-matching colour. These bunches are known by the trade as Bombay Bunches and are mostly marketed in Europe. 5.25. Bombay pearls commercial name for natural pearls chiefly from Pinctada radiata (6.52), fished from the Arabian Gulf and Red Sea and exported through Bombay, India (Mikkelsen, 2003). 5.26. Bonding the union or cohesion brought about by the use of a substance or an agent that causes two or more objects or parts to cohere. 5.27. Bonus cultured pearl See Lagniappe cultured pearl (5.93) and Keshi cultured pearl (5.91). 5.28. Buffing Golden South sea pearls wholesale removing organic residues from the surfaces of natural and cultured pearls following harvest (see also polishing, 5.148). 5.29. Button-shaped pearl a symmetrical domed-shape pearl with or without a flattish bottom. 5.30. Carat unit of weight (5.184) (mass 5.102), equal to one fifth of a gram (200 milligrams) or 4 grains (5.73). 5.31. Cerclé see circled cultured pearl (5.35). 5.32. Chaw The chaw is a system of converting weight into volume. Pearls in the Arabian Gulf and India are often sold by chaw. Chaw is calculated as follows: Chaw = (carat weight)² x 88 / no. of Pearls135 The Chaw price depends on the grade and type of pearls. 5.33. Chinese drilling a term applied to natural pearls that are, in general, button-shaped and drilled (5.55) with two drill-holes. Both drill-holes penetrate the pearl from different points on the flat or less-round side and meet at a point within the pearl. The drilling was originally designed to facilitate pearls being used as buttons. 5.34. Choker a strand of uniform sized natural pearls, cultured pearls or imitation pearls measuring 35-40cm (14 to 16 inches) in length. 5.35. Circled cultured pearl a cultured pearl (5.48) also known as cerclé,(5.31) with one or more concentric rings or indented grooves around it (Mikkelsen, 2003). 5.36. Clam pearl Mutiara Lombok and Miss Joaquim Pearls natural pearl from the hard-shell and giant clams, e.g., Mercenaria mercenaria (quahog)(6.41), Tridacna gigas (giant clam) (6.69) et.al., (Shirai, 1994, Hill., 2004, 1977, Hardy, 1947). Note: see Clause 2 Normative References; Convention on International Trade in Endangered Species of Wild Fauna and Flora 5.37. Cleaning following its removal from a mollusc, a pearl maybe cleaned of debris by immersion in water that contains various detergents. This process does not include any bleaching chemicals and is known as ‗cleaning‘. 5.38. Coating an artificial layer of any natural or artificial substance spread over the surface, or part of the surface, of pearls for protection, colouration, increased lustre and other optical phenomena (orient and overtone), decoration or to change appearance; a covering layer. Note: any natural or cultured pearl (5.118 and 5.48) that is coated, i.e., the outer layer is not composed of nacre laid down by a mollusc, shall be considered an imitation of a pearl (5.84). 5.39. Collar a strand of pearls, cultured pearls or imitation pearls measuring 25-33cm (10 to 13 inches) in length.