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Il-Grazzja u s-Sbuħija tal-Dehbijiet tal-Qroll

Il-qroll ilu popolari għall-użu f'disinji ta 'ġojjellerija u skopijiet ornamentali oħra għal żmien twil issa. Din il-popolarità tista 'tiġi attribwita fil-biċċa l-kbira għall-kuluri brillanti tal-gem, u n-natura kemmxejn mhux tas-soltu tal-oriġini tagħha. Il-qroll jinstab f'ilmijiet relattivament baxxi u sħan fil-Mediterran, u 'l barra mill-kosti tal-Ġappun u t-Tajwan. Għandu jinħasad manwalment, u l-għaddasa jgħoddsu f'fond kbir biex jirkupraw din il-ġawhra. Fuq il-wiċċ, il-kampjuni tal-qroll huma magħżula abbażi tad-daqs, il-kulur u l-kwalità. Kampjuni akbar bla difetti huma rari u pjuttost għaljin. Għalhekk jintużaw f'disinji ta 'ġojjellerija ta' livell għoli li jġibu prezz għoli tal-mistoqsija fis-suq miftuħ. Il-bqija tal-ħsad jintuża għal applikazzjonijiet ta 'ġojjellerija tal-moda. Dawn il-biċċiet tal-qroll huma ġeneralment rotob u għandhom jiġu stabbilizzati bir-reżina epossidika biex jibbieshom qabel ma jkunu jistgħu jinqatgħu u jiġu illustrati u stabbiliti fil-fidda jew metalli oħra biex tlesti l-biċċa. F'okkażjonijiet, żebgħa hija miżjuda ma 'l-epossi sabiex ittejjeb il-kulur tal-kampjun. Il-qroll jistgħu jinstabu f'firxa wiesgħa ta 'kuluri. Madankollu, qroll aħmar, roża, oranġjo u iswed biss huma tipikament użati fl-applikazzjonijiet ta 'ġojjellerija tal-moda. Il-qroll iswed huwa pjuttost siewi u nġabar mill-ispiża Messikana. Fi żminijiet riċenti, l-għaddasa ma setgħux isibu kwantitajiet kbar ta 'qroll iswed, u wassal lill-ambjentalisti biex iqajmu l-allarm dwar il-qerda u l-estinzjoni possibbli ta' xi speċi ta 'qroll.

Sabiex tifhem dan it-tħassib, huwa utli li l-ewwel tikseb fehim bażiku dwar il-formazzjoni tal-qroll. Il-qroll huma ffurmati mill-fdalijiet skeletriċi ta’ polip tal-baħar – ħlejqa ċkejkna li tgħammar fl-ibħra u titma’ mill-plankton. Il-fdalijiet huma kalċifikati u miżjuda mas-sikka tal-qroll maż-żmien. Fuq perjodu ta 'għexieren ta' snin, is-sikka tal-qroll tista 'tikber għal daqs kbir, u zkuk individwali jistgħu jkunu kbar daqs 2 pulzieri fid-dijametru. Madankollu, il-qroll huwa wkoll sensittiv ħafna għall-kundizzjonijiet ambjentali, u l-bidla fil-kimika tal-ilma baħar, il-penetrazzjoni tad-dawl u t-temperatura jista 'jkollha impatti devastanti fuq is-sikek tal-qroll. Ħsad żejjed tal-qroll għal ġojjellerija u applikazzjonijiet ornamentali flimkien mal-bidliet gradwali fil-kundizzjonijiet ambjentali wasslu biex is-sikek tal-qroll madwar id-dinja jiċkienu, u l-estinzjoni virtwali ta 'xi speċi. Għalkemm xi pajjiżi wiegħdu li jrażżnu l-ħsad u l-kummerċ f'xi speċi ta 'qroll, l-attrazzjoni tal-ġid finanzjarju fisser li l-infurzar huwa laxk. Wieħed irid jara jekk is-sbuħija ta’ din il-ġawhra twassalx ukoll għall-waqgħa tagħha.

Il-Grazzja u s-Sbuħija tal-Dehbijiet tal-Qroll 1

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