Nov 29, 2025
“This is a little hard to describe. Sort of a burgundy red with heathered, golden tones. Very large, heavy pearls with center ridging.”
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“This is a little hard to describe. Sort of a burgundy red with heathered, golden tones. Very large, heavy pearls with center ridging.”
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“A large number of these cultured pearls exhibit circling on their surface, typically with one or two main rings and sometimes additional ones. Examination of sliced samples by optical microscopy highlights the primary origin of the circling and the predominant role of predrilling the nucleus. As the cultured pearl rotates during its formation, each orifice on the drilled bead induces a groove on its surface with a spot defect right over the opening.
When this drill hole is perpendicular to the rotational axis of the cultured pearl, only one ‘equatorial’ ring is generated. When there is a fairly large tilt angle between the bead’s drill hole and the rotational axis, two grooves appear symmetrically relative to the equatorial plane, diametrically opposite with respect to the nucleus centre. With only a slight tilt angle between the drill hole and the rotational axis, the circles nearly overlap and a narrow ridge might eventually develop between the grooves.
The disturbance created by the drill hole is generally more pronounced on the side where the graft was inserted. Round-, drop- and baroque-shaped non-circled Ming cultured pearls were also investigated to clearly understand the influence of the nucleus drill hole. This research raises awareness of one of the major causes of defects that result from grafting techniques using drilled nuclei.”
Soil preparation remains a very important operation on degraded soils subject to current rainfall deficits in the Sahel. In order to find solutions to strengthen farmers’ resilience, a study was conducted at Farako-Bâ research Center in Burkina Faso to assess the impact of tillage and fertilization options on maize yields. To this end, a split-plot experimental design was set up with soil preparation techniques as the main factor with 3 levels three : no-till, tillage, ridging; and the fertilization as secondary factor with four levels: T1: Control, no fertilizer; T2: 5 t/ha of compost + 200 kg/ha NPK + 100 kg/ha urea; T3: 10 t/ha of compost + 200 kg/ha NPK + 100 kg/ha urea; T4: 200 kg/ha of NPK + 100 kg/ha urea (recommended mineral by extension service). Data collection was focused on soil chemical parameters, maize grain and biomass yields. The results showed that ridging provided the best grain (1807 kg/ha) and biomass (2074 kg/ha) yields, followed by tillage with 1110 kg/ha and 1340 kg/ha, respectively for grain and biomass. Organo-mineral fertilization generated the best results, with a grain yield of 2041 kg/ha for treatment T3 and 1635 kg/ha for treatment T2. Data showed positive interaction between soil preparation technique and fertilization for ridging and organo-mineral fertilization, with grain yields of 3462 kg/ha and 1972 kg/ha for treatments T3 and T2, respectively. The ridging appears to be a strategy for good management of soil nutrients and water in conditions of low rainfall in Burkina Faso.
i understand why some people dislike or devalue cultivated pearls with centerline ridging because they think it makes the pearl look fake or cheap, or because it emphasizes that the pearl is cultured & not natural.
i like it because it reminds me of lollipops or peanuts. why does the ridging happen?
“Nobody really knows for sure. We assume the pearl is rotating within the oyster, leaving rings or circles in the pearl’s nacre. But farmers still can’t predict or control when this happens.” (PearlsOfJoy)
Ridger Help Farmers in Agriculture | Fieldking
Ridgers are like handy tools that farmers use on their fields. These tools make farming easier and help in different ways. One of the main things ridger do is help with planting certain crops in neat rows. They create lines in the soil where farmers can put seeds or small plants. This makes it easier to grow crops evenly, especially for things like potatoes, sweet potatoes, and sugarcane.
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Blender Destruction. Tuts from Surface Studio. #blender #desttuction #animation #ridging #motiongraphic #mo #mostudiovfx #motiondesign #visualeffects #b3d #simulation https://www.instagram.com/p/B_oZb1PHidn/?igshid=g4s7m2yofhvc