Nata Heng Schluessel, GG logo Roland Schluessel, FGA

Rubies

The famous Dattaw Ruby mine on the flank of the Mogok Valley. Myanmar(Burma) is the major source for unheated Rubies worldwide 2
The famous Dattaw Ruby mine on the flank of the Mogok Valley. Myanmar (Burma) is the major
source for unheated Rubies worldwide.
In Mogok, large Ruby crystals are often found inside the marble mother rock.
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A spectacular specimen from Mogok: Ruby crystal in calcite. Silk inclusions in an unheated Ruby from Mogok Unheated Ruby from Mogok, 2.02 ct.


We provide a selection of exquisite untreated and traditionally enhanced Rubies from Burma (Myanmar), ranging from 1 to 5 carats. Exceptional unheated gems up to 20 carats are available on request.

We specialize in classic cut single stones, pairs and matched suites.

If you are looking for the vivid ruby red color commonly called “pigeon-blood red”, contact PILLAR & STONE INTERNATIONAL and experience our outstanding quality standards matched with our highly competitive pricing.

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WHAT IS A GEM RUBY?

MINERAL SPECIES:

Corundum.

APPEARANCE:

Best color = Vivid red, not too dark and not too light, without overtone of brownish (best under incandescent light).
Popular expression for the best color = Pigeon-blood red.
Dichroism = Strong, purplish red and orangey red.
Fluorescence = Strong and pleasant for Rubies with low iron content.
Transparency = Transparent (if not too much included).
Clarity = Inclusions are accepted to a certain extent and partly reflect the quality and price of a Ruby.
Brilliancy = High; may be covered by a too strong color saturation or too many inclusions.
Phenomena = Asterism; Star Ruby (semitransparent; lower part of the cabochon cut is kept unpolished).

FACET CUTS:4

Cushion cut = A premium is often add to this ideal cut for a Ruby.
Oval = Ideal and most common shape for Rubies.
Pear shape, heart shape and marquise cut = Fancy cuts reach slightly lower prices.
Rounds and squares = Rare in sizes over 6 mm.
Emerald cut = Very rare and fetch premium prices because of the high quality of rough that has to be cut.

PHYSICAL PROPERTIES:

Hardness = 9
Toughness = Excellent (fracture filled Rubies have to be handled with special care).
Cleavage = None (may show parting on twinned stones).
Refractive Index = 1.762 – 1.770
Specific Gravity = 4.0

CLEANING METHODS:

Ultrasonic and Steamer = Safe for Rubies of fine quality, but never for oiled stones (fracture filled rubies have to be handled with special care).
Warm soapy water: Safe, but not for oiled stones.

STABILITY:

Reaction to heat = Good but may sometimes alter its color. Caution: Do not heat unheated Rubies!
Reaction to chemicals = Boron.

MAJOR SOURCES:

Myanmar ( Burma), Thailand, Cambodia, Madagascar, Sri Lanka ( Ceylon), Vietnam, India, Tanzania, Kenya, Afghanistan, Pakistan.

BEST QUALITIES:

Unheated Rubies from Mogok in Myanmar ( Burma).

STRONGEST PRICE JUMPS:5
3 ct, 4 ct, 5 ct, 8 ct and 10 ct sizes.

ENHANCEMENTS:

Mainly heated; also fracture filled, dyed, impregnated and color diffused. The FTC requires complete disclosure and explanation of all these treatments.

IMITATIONS:

Imitated by synthetics and other man-made imitation stones.

MOST RESEMBLING GEMSTONE:

Natural red Spinel.

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