2025年3月22日 · Nacre is Composed of Aragonite Platelets Pearls and Mother-of-Pearl are made from Calcium Carbonate, which exists naturally in two different forms: Calcite and Aragonite. The shells of most mollusks (those without mother-of-pearl shell) are made from Calcite, and fewer will produce and display Aragonite, which forms hexagonal shaped crystals.

2019年12月13日 · Hello humans! Just looking to see if I can get some insight into the correlation of nacre thickness and lustre quality in cultured pearls. Most of the online resources I've read that explain pearl quality and grading seem to assert that in …

2011年6月24日 · Hi All, Came across these photos of an Antique (natural ?) pearl and am naturally find it very interesting. I have wondered before what is the actual cause of missing nacre such as this pearl displays in abundance. Could it be a parasite? Or could it be something else inside the oyster...

2008年12月6日 · The chief natural sources of mother of pearl are the pearl oyster, freshwater pearl mussels and abalone shell, shown here. Getty Images THE GIST: Artificial nacre, or mother of pearl, can now be mass-produced. The material is flameproof, super strong and as cheap as paper to make. It could be used to fireproof homes and to make cars more fuel ...

2004年12月11日 · Tissue Nucleation Pros: 1 Produces a solid nacre cultured pearl that is indistinguishable from the original, real, natural, wild, pearls 2 The resultant pearls can be judged by any of the original, authentic, pearl standards for natural pearls. 3 Tissue-nucleated pearls are far more likely to...

2004年8月12日 · Does pinking and/or bleaching decrease the value/beauty of a pearl by damaging the nacre on the surface? I know that pearls all undergo a bleaching process so they appear whiter... bleach seems like a pretty harsh chemical to use on sensitive pearls.

2014年7月24日 · Mother-of-Pearl Defined Mother-of-Pearl (MOP for short) or Nacre (as it is also known) is the iridescent coating on the inside of some mollusk species which is composed of aragonite and calcite, both being calcium carbonate polymorphs. MOP also contains water and binding proteins secreted by the mollusks, the most important being conchiolin.

2014年11月23日 · The key is that it comes from within the nacre and the effect is not limited to the surface. If you look at black Tahitian pearls with colorful surfaces, the body color is black (or dark gray), while the surface color is entirely overtone because the darkness of the nacre does not allow enough light refraction for orient.

2006年8月16日 · Hi everyone. I am in the process of buying my first strand of akoya pearls, a blue strand from Vietnam. I love and have collected pearls for a long time and have avoided akoyas because of my concerns about nacre thickness. However, I adore the blue color of the Vietnamese akoyas and want a...

2005年1月2日 · I'm curious about what is on the certificate pictured above. I see "excellent" luster, "clean" surface, "excellent" matching-- but only "acceptable" nacre. Does this refer to nacre thickness? Is "acceptable" 0.4mm, which is what I have previously read is the minimum thickness for hanadama certification, or does GIA use another number?