Scratches are fine white straight or curved lines on the surface of the diamond, which arise from contact with other diamonds (Fig 342). They can easily be removed by re-polishing and do not influence the quality of the polish unduly.
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Scratch hardness: Resistance to fracture or plastic (permanent) deformation due to friction from a sharp object
Indentation hardness: Resistance to plastic (permanent) deformation due to impact from a sharp object ...
Scratches: These are referred to as thin lines on the surface. It is mostly formed when the stone undergoes the different steps of gemstone processing like cutting or polishing. There are very less chances that it happens naturally.
Scratches
Scratches are scratches on the outside of the Diamond usually caused by the polisher or rubbing up against another Diamond.
Grain Lines ...
Scratch (S)
A fine whitish line that can be curved or straight.
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Loose Diamonds ...
Scratch: A linear indentation normally seen as a fine white line, curved or straight.
Scratches - Narrow, shallow, elongated, rough-edged depressions on the surface of a fashioned diamond, usually appearing as faint white lines under magnification.
scratch A blemish that appears as an elongated, whitish to grayish, shallow line on the surface of the diamond. Caused by contact with another diamond.
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secondary deposits See alluvial deposits.
8-10: scratches window glass, but not scratched by steel file:
Hardness can be directional.
Scratch resistant crystal.
SCREW DOWN LOCKING CROWN
A crown which aids water resistance by sealing the crown against the case.
Scratch brush a piece and burnish it or tumble for 45 minutes or more to a mirror finish. Use the LOS to patina the piece to a dark black.
Scratch
A diamond flaw caused by rubbing diamond with abrasive. Present in the form of tiny white lines.
Semi mount ...
Any scratch, nick, abrasion, knot or any other flaw on the surface of a diamond. This affects clarity. A blemish could be natural or be the result of polishing.
Brilliant-cut ...
Scratches Ruby
Diamond: 10
Mokume Gane
Japanese metalworking technique that creates a finish resembling the wood grain.
Nicks, Scratches and Abrasions
Natural: A portion of the diamond's rough or original surface left on a polished stone, usually at the girdle.
Polish Lines: Fine, transparent or white parallel grooves and ridges left by polishing.
A clear, scratch-resistant covering used on fine watches.
Satin Finish ...
Blemish
A scratch or abrasion on the surface of a diamond. Provided they do not interfere with the symmetry of the stone and do not interfere with light in the stone they are not considered important.
Blemish and scratch on the side. Non- returnable
Agate Chalcedony$ 9.99
Item #AGT346
49.44 ct.
A diamond can scratch another diamond, as well as other jewelry pieces, so store diamond items separately. If you need to store diamond items together, make sure they aren't tangled together so they won't scratch one another.
Starting From Scratch
Moh took ten well known, easily available minerals, and arranged them in order of their "scratch hardness".
If a specimen to be tested can be scratched by a known mineral from the list, it is softer than that mineral.
Will platinum scratch? Signs of wear, including scratches, will inevitably appear in all precious metals, even with platinum. Due to platinum's amazing durability and strength, however, there is little or no material loss when it is scratched.
Whichever mineral scratches the other is harder, if both scratch each other then they are of the same hardness.
What could possibly scratch a diamond? Another diamond. To prevent such scratches, separate diamond jewelry in your jewelry box. Diamonds also can scratch other gems or jewelry, especially soft items like pearls.
Agates are subject to cracking or scratching if handled roughly. The agate is said to bring good luck, prevent bad storms, build self confidence, and for lucky ladies, to secure the love of princes.
A mineral is locked into position , and a Diamond pin pushes down and slightly scratched the mineral. The amount of pressure needed for the Diamond pin to be pushed down to scratch the mineral determines its hardness.
As with all gemstones, care should be taken to protect it from scratches, sharp blows, and extreme tempera-ture changes.
Garnets are found in the U.S., Africa, Sri Lanka, Brazil and India.
February
Amethyst ...
Store each piece separately so that other jewelry will not scratch it. Amethyst - if properly taken care of, will last indefinitely. Amethyst should be protected from sharp blows and scratches but is otherwise quite resistant to normal wear.
A relatively soft stone with a hardness of only 4, Fluorite is easily chipped or scratched.
Stones that have a Mohs hardness of less than 8 are highly subject to scratching; harder stones are less likely to be scratched but are still subject to chipping and fracture.
Bracelets and rings are more vulnerable to bumps and scrapes than other types of jewelry, but you should check all your pieces every few months for loose gems, broken prongs, chipped stones, scratched metals, nicked nacre on pearls, etc.
True hematite leaves a red streak when scratched across a piece of unglazed porcelain, while the simulated products usually leave a gray streak.
Store each piece of gemstone jewellery separately and necklaces flat so that harder stones don't scratch softer ones. Almost every gem is harder than the metal in which it is set.
Rubies and sapphires come next in hardness - they are one and the same stone, except for the coloring matter - and emeralds rank third, being, even though third, yet so hard that nothing will scratch them but a precious stone.
The pearl stands alone.
Obviously with delicate crystals scratching is not the problem, they will simply break off from the force. With delicate specimens we need to use an ultrasonic cleaner.
Hardness is defined as the level of difficulty with which a smooth surface of a mineral specimen may be scratched. Hardness has historically been measured according to the Mohs scale.
This has traditionally been achieved by lightly scratching the gold item on what is called a touchstone, which is a mildly abrasive, dark colored piece of jasper or quartz.
Higher the level of hardness, better the chances of the gemstone's resistance to scratches and abrasion. Also, the chemical structure of ruby makes it very tough, helping in resistance to breaking, chipping and cracking.
Like all precious metals, platinum does scratch. This holds especially true when it has a high-polish finish, because of the high contrast between the polish and the scratch.
Fluorite Has limited use as a gemstone because it is relatively soft and easily scratched. Despite its fragility, stones are faceted and can be polished very brightly.
Satin finish: A series of tiny parallel lines scratched onto a surface with a wire brush or polishing tool to produce texture. Satin finish is also called "brushed" or "matte" finish.
The gold can be dented, bent and scratched very easily. The colour of pure gold is a warm rich yellow.
21K (875) Gold:
This is mostly regarded as the highest quality to be used in jewelry.
its girdle, or if that is so set as not to be available, a corner where several facets meet) gently to the flat surface of one of the softer test stones, drawing it lightly along the surface and noting the feel and looking to see if a scratch results.
The hardness of the mineral refers to its resistance to scratching and abrasion and also to the cutting resistance.
A substance's hardness value indicates the materials resistance to scratching and grades minerals on a comparative scale from 1 (very soft) to 10 (very hard)..
The hardness of a gemstone is its resistance to scratching and may be described relative to a standard scale of 10 minerals known as the Mohs scale. F. Mohs, an Austrian mineralogist, developed this scale in 1822.
The Mohs' scale arranges minerals according to their degree of resistance to mechanical scratching of their surfaces. The scale ranges from one to ten.
If you have already bought a stone, and are suspicious of its authenticity, buy a carbide scriber from a jewelry supply store and attempt to scratch the surface of one of the bottom facets.
Friedrich Mohs, a German mineralogist, developed an assessment of "scratch hardness" by ranking 10 different stones from hardest to softest.
scratches and wheel marks
Scratches are caused by improper storage of the diamond in the diamond paper or contact with other diamonds. If diamond is polished without care, grooves called wheel marks can occur.
extra facets ...
Well just about the only thing capable of scratching Tungsten Carbide is Diamond. Tungsten which has been polished will never need to be polished again and will be next to impossible to scratch.
I don't like to clear jewelry in water of any kind, and I don't bury jewelry in salt, as this may scratch it. This leaves me with various choices.
I used to place pendants on large quartz or black tourmaline clusters.
Opal is brittle, heat sensitive, and breaks and scratches easily. Some varieties self- destruct through the loss of water. Even with these drawbacks, opal still is a premier gemstone.
Sand or dirt will not scratch a CZ or a diamond, but CZs and diamonds will both scratch glass. A CZ weighs more than a diamond, and that is one of the principal ways to tell them apart.
Whilst its good hardness protects the emerald to a large extent from scratches, its brittleness and its many fissures can make cutting, setting and cleaning rather difficult.
Blemish: Any flaw, spot, scratch or cut that appears on the surface of a gemstone. Blemishes for pearls can include spots, bumps, pits, holes, cracks, chips, wrinkles and dull spots.
The Diamond is uniquely resistant to damage by heat or scratching, and can be cut or polished only by another diamond. The diamond is thousands of times harder than corundum, the next hardest substance from which rubies and sapphires are formed.
5 when scratched parallel to the long axis of the crystal and approximately 6.5 when scratched perpendicular to or across the long axis. It has a vitreous to almost pearly lustre and is transparent to translucent.
Always remember to store pearls separately in a soft cloth pouch, linen cloth, or soft lined jewelry box from the other jewelries to prevent it from being easily scratched or damaged.
 See also: Stone, Jewel, Color, Gemstone, Jewelry
  
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