Schumann W: Gemstones of the World

Name: Schumann W: Gemstones of the World
Brand: Blackwell's
SKU: 55844220666234
Price: 30.9 CHF
Availability: InStock

Newly Revised Fifth Edition.

Truly the ultimate one-volume book every hobbyist, jeweler, jewelry maker, and rockhound will ever need! Chock-full of more than 1,500 full-color photos showcasing each precious and semiprecious stone in both its rough and polished state, this bestselling reference book from leading geology expert Walter Schumann will be your go-to identification guide.

Following the spectacular success of the first four editions of Gemstones of the World, the revised fifth edition exhibits important updates and a beautiful new cover. All the gemstones ever discovered are treated here in their many variations. More than 1,500 full-color photos showcase each precious and semiprecious stone in both its rough natural state and its polished and cut renditions. Each entry offers complete information on a stone's formation and structure; physical properties and characteristics; and methods of working, cutting, and polishing.

You'll find full treatments of lesser-known gems and minerals-from andalusite to vesuvianite-and a special section devoted to rocks as precious stones, including alabaster, onyx, obsidian, and fossils. Organic gem materials such as coral, ivory, amber, and pearl are also covered, along with more recently discovered stones like charoite. Additionally, this all-inclusive rocks and minerals book includes imitations, synthetics, and combined stones. Charts and tables help you identify unknown gemstones and-if you're in the market-how to check for authenticity.

Whether you're a beginner rock enthusiast or geologist, or are looking for a crystal book to support your spirituality practice, Gemstones of the World will bring new beauty and wisdom to your bookshelf.

Size chart

Bracelets, bracelets, bracelets, bracelets, chains

age	Wrist circumference
Newborn	9 - 12 cm
6 months - 3 years	12 - 14 cm
4 - 10 years	14 - 15 cm
Teenager, ladies (XS)	15 - 16 cm
Ladies (M)	16 - 17 cm
Ladies (XL)	18 - 19 cm
Men (M)	18 - 20 cm
Men (XL)	21 - 22 cm

Brief instructions for measuring wrist size:

Loosely wrap a measuring tape or string around your wrist where you want the bracelet to sit. Make sure that it fits snugly but does not cut in. Read the circumference directly from the measuring tape or measure the length of the cord with a ruler.

Note:
The length of the bracelet may be 1 cm to 3 cm longer than the measured wrist circumference, depending on your taste.

Finger rings

Ring size	Inner diameter	Inner circumference
48	15,3 mm	48 mm
50	15.9 mm	50 mm
52	16.6 mm	52 mm
54	17.2 mm	54 mm
56	17.8 mm	56 mm
58	18.5 mm	58 mm
60	19.1 mm	60 mm
62	19.7 mm	62 mm
64	20.4 mm	64 mm
66	21.0 mm	66 mm

Brief instructions for measuring the ring size:

Method 1: Measure the inner diameter of a suitable ring

Take a ring that fits well.
Place it on a ruler and measure the inner diameter (from one inner edge to the other).
Compare the diameter with the table to determine the ring size.

Method 2: Measure the circumference of your finger

Take a thin strip of paper or thread.
Wrap it around the part of the finger where you want the ring to sit (not too tight).
Mark the point where the ends meet.
Measure the length of the strip in millimeters. This is the inner circumference.
Find the right size in the table.

Tips:

Measure the finger size in the evening, as fingers swell slightly during the day.
If you are between two sizes, choose the larger size.
Make sure that the ring fits over the knuckle.

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