How Big is a Millimeter and other FAQ

Millimeter Conversion

1/4 Inch = 6.35 mm

US Dime = 17.80 mm

1/2 Inch = 12.70 mm

US Penny = 19.00 mm

1 Inch = 25.40 mm

US Nickle = 21.20 mm

Millimeter Converter

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Birthstone List

January

Garnet

February

Amethyst

March

Aquamarine

April

Diamond

May

Emerald

June

Alexandrite or Pearl

July

Ruby

August

Peridot

September

Sapphire

October

Opal or Tourmaline

November

Topaz or Topaz Quartz

December

Blue Zircon, Turquois, Tanzanite, or Lapis Lazuli

Wedding Anniversary Gifts

Year

Traditional Gift

Modern Gift

 1

 Paper

 Clocks

 2

 Cotton

 China

 3

 Leather

 Crystal/Glass

 4

 Fruit/Flowers

 Appliances

 5

 Wood

 Silverware

 6

 Candy/Iron

 Wood

 7

 Wood/Copper

 Desk Sets

 8

 Bronze/Pottery

 Linens/Laces

 9

 Pottery/Willow

 Leather

 10

 Tin/Aluminum

 Diamond Jewelry

 11

 Steel

 Fashion Jewelry

 12

 Silk/Linen

 Pearls

 13

 Lace

 Textiles/Fur

 14

 Ivory

 Gold Jewelry

 15

 Crystal

 Watches

 20

 China

 Platinum

 25

 Silver

 Silver

 30

 Pearl

 Diamond

 35

 Coral

 Jade

 40

 Ruby

 Ruby

 45

 Sapphire

 Sapphire

 50

 Gold

 Gold

 55

 Emerald

 Emerald

 60

 Diamond

 Diamond

Why Does Gold Discolor Fingers?

Your may think that faulty manufacturing or underkarating might be the problem when a ring "turns," blackening or discoloring the skin and clothing, or the jewelry itself. However, that is not the case.

The most common reason is metallic abrasion, caused by makeup on skin or clothing. Cosmetics often contain compounds harder than the jewelry itself, which wear or rub off very tiny particles. Very finely divided metal always appears black rather than metallic, so it looks like a jet-black dust. When this dust comes into contact with absorbent surfaces such as skin or clothing, it sticks, forming a black smudge.

To prevent this, you should try switching cosmetics. If this is not possible, we recommend that you remove rings and other jewelry while applying them, and clean skin areas in contact with jewelry with soap and water.

Another cause is actual corrosion of the metals. Gold itself does not corrode, but its primary alloys of silver or copper will do so—forming very dark chemical compounds—under moist or wet conditions. When you perspire, fats and fatty acids released can cause corrosion of 14-karat gold, especially when exposed to warmth and air.

This problem can be worse in seacoast and semitropical areas, where chlorides combine with perspiration to form a corrosive element that discolors skin. Smog fumes gradually attack jewelry and are evident as a tarnish that rubs off on the skin.

On several occasions I have come across the suggestion that a general iron deficiency or anemia can be the cause of this "black smudging". I am aware of no studies done to date on this correlation. Specifically, the correlation between a persons iron levels and their ph levels. I suggest that there is a direct and identical correlation between a persons iron level and their ph level. That is to say as their iron level decreases so does their ph levels. Their body chemistry becomes more acidic. Therefore, the cause of the discoloration would be the increase of acidity, as outlined above, and not the iron deficiency itself.

We suggest that you remove jewelry often and use an absorbent powder, free of abrasives, on skin that comes into contact with jewelry. Even the design of jewelry can be an influence. Wide shanks have more surface area to contact abrasives or corrosives. Concave surfaces inside a shank form collection points that trap moisture and contaminants, also causing a type of dermatitis.

You should remove all rings before using soaps, cleaning compounds or detergents, and clean your jewelry frequently. As well as solving the problem, you’ll be amazed at how much better your jewelry looks! As always, have your jewelry professionally inspected 3-4 times a year. A minor repair can become a major replacement if left unchecked.

Millimeter converter is courtesy of www.unitconversion.org