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'Breathing holes' isn't a common term used by jewelers who set precious stones in metal to make jewelery.

If, however, you mean openings in the setting that provide the stone access to available light from all sides, then, yes: precious gems are best displayed in settings with these openings.

Finally, imitation gemstones are often set with glue, covering all access to light, except from the top.

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because when sodium comes into contact with air it goes dull and reacts. this could burn your skin so that's why

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125, 9,0 - r,g,b

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A diamond core drill, slow and easy, with plenty of water.

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The function of a loupe is to magnify details that are a little too small for the naked eye. They are cheap and highly portable magnfying lenses that let, for example, a jeweler see tiny things like internal inclusions or flaws in a gemstone, or damage to a stone or setting, or karat markings and other tiny inscriptions on jewelry, etc.

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This is highly variable, depending on a number of factors, eg. his experience level, what kind of merchandise he handles, and where he's located. A jeweler in Beverly Hills designing six or seven figure necklaces for celebrities will make substantially more than a guy setting turquoise into silver in a small village in Mexico.

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Sterling silver is an alloy of silver containing 92.5% by mass of silver and 7.5% by mass of other metals, usually copper. Sterling silver is most often used for jewelry because of its combination of attractiveness and durability. Acceptable quality marks for sterling silver include: sterling, ster and .925.

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If repeated washing with soap and water doesn't do the trick, I'd put everything into a sealable box or bag and dump in a whole pile of baking soda, leave it alone for a week. It that doesn't work, try peroxide. If that doesn't work, there are a ton of commercial products available, but little info on their efficacy; eg. Nature's Miracle, Diaper Pure, Urine-Off. Personally, if the supplies didn't cost that much, I'd just chuck 'em.

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Indeed, they can. In Japan, clam shells are a commonly used as kiln furniture to allow the heat (and ash) to circulate below a pot.

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Yes, it's possible, but rust might be an issue. More typical use of meteorites in jewelry are gold bands inset with etched meteoritic iron, also now on the market are facetted stones cut from gem-grade olivine inclusions found in certain pallasite meteorites.

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A jewelry recycler is not interested in low value stones like marcasite. They'll pop the marcasite, weigh the silver, and pay you according to grade, weight, and current price. I'd strongly suggest asking the company you intend to do business with what their policies are, no doubt there are variations.

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You could wrap the coin in gold or silver wire and form a loop to pass the cord through. You could find a mount, called a finding, of the right size; these come in every imaginable shape and size, and are meant for mounting polished stones into. You could embed the coin in acrylic plastic and drill a hole in the plastic. Doubtless there are other methods that wouldn't destroy the coin by drilling it.

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Sai is a Jewelry brand.

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Most gems, like malachite do not have a widely accepted grading system like diamonds do, so terms like "AAA grade" are relatively meaningless and more clever marketing than anything else. One seller's purported "top quality grade AAA" material might be very different from anothers. Generally, what you're seeking in top grade malachite is material that has good bright color, contrasting banding, attractive patterns, no soft spots, no cracks, no pitting, and no inclusions of other minerals. An exception to the latter would be when malachite is combined with azurite, which makes for a fabulous and colorful gem.

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Remove any stones, put the jewelry into a crucible, and the crucible into a furnace, heat until melted, pour into molds. A blowtorch would do the job as well, ideally oxy-acetylene.

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I assume you mean the small magnifier worn on a band to hold it in front of one eye. It is called a loupe.

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As agricultural productivity increased, fewer people were needed to work in the fields producing food, These extra people who weren't needed to farm and could then become artisans.

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Yes, diamonds can be set in platinum, silver, stainless steel and palladiam.

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A "900" stamp on silver tells you that it is 9 parts pure silver and 1 part other metals.

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This is typically a gem polishing problem and can have varying fixes. Read up on the particular stone and change your polishing method; eg. you may have to switch from aluminum oxide on canvas to fine diamond on a hardwood wheel, or you may have to pay closer attention to heat. A more specific question will enable a more specific answer.

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Pure gold is not practical for most jewelry applications because it is too soft so other metals are added to make it harder. Items that are marked "P" for plumb means that it has more gold in it and thus more valuable so 10kp is more valuable than 10kt. Pure gold is not practical for most jewelry applications because it is too soft so other metals are added to make it harder. Items that are marked "P" for plumb means that it has more gold in it and thus more valuable so 10kp is more valuable than 10kt.

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There are a number of different options regarding the setting with pave being one of them. It refers to when many stones are set very closely together, about 1 millimeter apart.

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There are many different types of abrasives that may be used to polish rocks, from diamond powder to aluminum oxide, cerium oxide, etc.

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Green turquoise can be actual turquoise; Nevada produces shades of green.

The term is also sometimes applied to variscite, but this is nonsensical, foolish, and misleading, as variscite is a beautiful and valued gem that needs no other name. Sadly, the jewelry trade is rife with such idiocy; eg. red emerald and green amethyst.

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You could try, but I'd suggest that the heat involved would severely damage if not destroy the pyrite. Try epoxy, or wire wrap your pyrite.