Friendship bracelets are special bracelets
Friendship bracelets are special bracelets. As a symbol of friendship these bracelets are given from one friend to another. The amount of thread used in bracelets can vary. They are handmade and usually made out of embroidery floss or thread. Thicker bracelets are commonly worn by both male and female surfers. There are various styles and patterns, but most are based on the same simple half-hitch knot.
They are particularly popular with pre-teen and adolescent girls and with present-day hippies, deadheads or Rainbow Family participants. The smallest pattern, a double chain knot, requires two strings. The making of friendship bracelets is a version of macrame. Because of their versatility, they are worn by both males and females of all ages. The candystripe can have as few as three strings and as many as forty, based on pattern and thickness.
Gemstones are identified by gemologists
Gemstones are identified by gemologists. The first characteristic a gemologist uses to identify a gemstone is its chemical composition. Gems are characterized in terms of refractive index, dispersion, specific gravity, hardness, cleavage, fracture, and luster. They may exhibit pleochroism or double refraction. Who describe gems and their characteristics using technical terminology specific to the field of gemology.
Next, many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic. They may have luminescence and a distinctive absorption spectrum. For example, diamonds are made of carbon (C) and rubies of aluminium oxide (Al2O3). Another term used is habit, the form the gem is usually found in. For example diamonds, which have a cubic crystal system, are often found as octahedrons.
A perfect diamond has no flaws
A perfect diamond has no flaws. In valuing diamond, Diamond clarity is one of the important features. Most of the 20 percent that are gemstone quality still have significant flaws. An inclusion is a type of flaw that occurs within the internal characteristics of a diamond. The others are cut, caret, and color. So, when it comes to diamond clarity it is considered a flaw.
Only 20 percent of diamonds mined are good enough to be used as gemstones. Diamonds are categorized as Flawless, Very Slightly Included, Slightly Included, Internally Flawless, and Included. Within these categories, there are grades. The rest are relegated to industrial use. When magnified under a 10x microscope, The Flawless diamond is, well, flawless. The flaws may even be visible to the naked eye and are considered Included You’ll pay a pretty penny for superior diamond clarity.