Obsidian is a natural glass that forms from volcanic activity. The gemstone is made of the same minerals as granite, but cools so quickly when exposed to air that the minerals do not have time to crystallize. Some inclusions can be bubbles or crystals, creating a random pattern such as snowflake. Obsidian has been used for tool making since at least 21,000 B.C. and used in jewelry for many centuries. American Indians used it for arrowheads, and the Aztecs used a great deal of obsidian for items such as sacrificial knives and mirrors. Major sources include Iceland, Italy, the U.S.A, Japan and Java. Width: 6 mm.
Use a tape measure. Wrap the tape measure around the wrist on which you plan to wear your D.C.I bracelet. To ensure the bracelet fits comfortably, add 1.5 cm. You can then add or subtract centimeters according to whether you prefer a loose, exact or tight fit. If you don not have a tape measure, use our Wrist Sizer: Download and print the D.C.I Wrist Sizer.
Download the D.C.I Wrist Sizer for A4 format.
Download the D.C.I Wrist Sizer for Letter format