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Conversions, Weights, Enhancements, Etc.

Millimeters to Inches Conversion Chart

Many pictures are enlarged to show the detail of our products. 
Always refer to the approximate stone or product sizes provided to determine
actual size. Below are some approximate "millimeter to inches" conversions-


Millimeters 1.6mm 2.4mm 3.2mm 6.4mm 9.5mm 12.8mm







3/32" 1/8" 1/4" 3/8" 1/2"





* Millimeter measurements are rounded off to the nearest 10th.

  • Example #1: If an item is 19 x 25mm... 
    it measures approximately 3/4" x 1".

  • Example #2: If an item measures 5mm wide...
    3.2mm + 1.6mm = 1/8" + 1/16" (see chart above)
    so 5mm is about 3/16" wide.

  • Example #3: If an item measures 32mm tall...
    25.4mm + 6.4mm = 1" + 1/4" (see chart above)
    so 32mm is about 1 1/4" tall.

Stones are measured from one edge to
the other (the diameter).  Two measurements
are usually provided for fancy shape stones.

Ring Width- The widest TOP
measurement of a ring setting. 
(Most, but not all, rings are
narrow or tapered at the shank.)

How to Read Product Weights- DWT and Grams
*NOTE: All weights and sizes provided are only approximate & will vary.


Weight Conversion Chart
Note: One DWT (pennyweight) is heavier than one gram.

To compare pennyweight (dwt) to grams-
Take the listed DWT and multiply by 1.5552
Example:  5.5dwt  x 1.5552 = about 8.55 grams

To compare grams to pennyweight-
Take the listed GRAMS and multiply by 0.643
Example: 8.55 grams x 0.643 = about 5.5 dwt

How to read the product information shown below...

Common Gemstone Enhancements & Treatments

Enhancement: Any treatment process other than cutting and polishing that improves the appearance (color/clarity/phenomena), durability, or availability of a gemstone.

Some gemstones come from the earth with a color that is simply made beautiful by the cutting and polishing process. Many others are enhanced with various processes or treatments to improve or produce their beautiful color and/or clarity.  For example, "blue" topaz is colorless or near colorless until it has been irradiated.  Almost all tanzanite is produced by heating brown zoisite. Below are some of the common gemstone enhancement and treatment processes for colored stones...

Note: If a stone says it is "Created" it is a man-made stone, NOT a genuine stone.

Alexandrite- Stones may be oil or resin infused with colorless oil, wax, natural resin, or unhardened manmade material to improve appearance. Amethyst- This gemstone is routinely enhanced.

Aquamarine- Most are heat treated to reduce green overtones.

Black Star Sapphire- Not currently known to be enhanced.
Blue Topaz- Irradiated and/or heat treated. Blue Zircon- Heat treated to effect desired alteration of color and clarity.
Citrine- Heat treated to effect desired alteration of color and clarity. Diamonds- Not currently known to be enhanced.
Emerald- This gemstone is routinely enhanced. Frequently oiled to fill voids and faults in emeralds to improve the overall appearance. Garnet- Not currently known to be enhanced.
Iolite-  Not currently known to be enhanced. Jade- Not currently known to be enhanced.
Lapis Lazuli- Dyed to give a new color, intensify present color, or improve color uniformity. Mexican Fire Opal- Routinely enhanced.
Moonstone- Not currently known to be enhanced. Onyx- Dyed to give a new color, intensify present color, or improve color uniformity.
Opal- Not currently known to be enhanced. Cultured Pearl- Routinely enhanced.
South Sea Cultured Pearl- Not currently known to be enhanced. Peridot- Not currently known to be enhanced.
Ruby- Frequently heat treated to remove purple and brown overtones and to improve clarity. Sapphire- Frequently heat treated to improve color and clarity.
Smokey Quartz- Irradiated to alter color. May also be heat treated. Tigereye-  This stone is routinely enhanced.
Tanzanite- Heat treated to produce it's color. Tourmaline- Several enhancements are used.

© Copyright 2003-9 J. Dunne.  ALL RIGHTS RESERVED. Copying from this web site is a violation of copyright law.  Pictures and content are for viewing only at this address and remain our property. They may NOT be copied, reproduced or modified in any form or manner. Use of this web site constitutes your agreement to our online store policies and terms. You must be at least 18 years of age to order from this store. We reserve the right to correct errors. Many of the items and designs are also copyrighted. 

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 Pomeroy Jewelers  -  3946 Park Lane  -  Traverse City, Michigan 49686  -  Telephone: (231) 938-2582
www.favoritejewelry.com     Contact Us- www.favoritejewelry.com/contact-us.htm

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