Nata Heng Schluessel, GG logo Roland Schluessel, FGA

Sapphires

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Kashmir-Zanskar is the historic source of the cornflower blue Sapphires. Mining for Sapphires in the Western part of the Mogok Valley. This area is the major source for unheated blue Sapphires worldwide.
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Sapphire rough from the Mogok area. An 8 ct Mogok Sapphire and a 6 ct Kashmir Sapphire. Both gems are unheated and reveal the most appreciated cornflower blue. An unheated, 50 ct Burmese Sapphire showing its highly appreciated vibrant color.

We offer a selection of impressive unheated and traditionally enhanced Sapphires from Burma (Myanmar), Sri Lanka and Madagascar, ranging from 1 to 20 carats. Exceptional unheated gems up to 100 carats are available in the vibrant “royal blue” and “cornflower blue” color types.

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

Contact PILLAR & STONE INTERNATIONAL and experience our outstanding quality standards matched with our highly competitive pricing.

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WHAT IS A GEM SAPPHIRE?

MINERAL SPECIES:

Corundum.

7APPEARANCE:

Best color = Vibrant and vivid blue, not too dark and not too light, without overtone of grayish or greenish (pleasant in daylight and incandescent light).
Popular expression for the best colors = Cornflower blue and Royal blue.
Dichroism = Moderate to strong, violetish blue and greenish blue.
Fluorescence = Inert to Strong but insignificant for the Sapphire’s appearance.
Transparency = Transparent.
Clarity = Discrete inclusions may be accepted, but less than in Rubies; they partly reflect the quality and price of a Sapphire.
Brilliancy = High; may be slightly covered by a strong color saturation.
Phenomena = Asterism; Star Sapphire (semitransparent; lower part of the cabochon cut is kept unpolished).

FACET CUTS:

Cushion cut = A premium is often add to this ideal cut for a Sapphire.
Oval = Ideal and most common shape for Sapphires.
Pear shape, heart shape and marquise cut = Fancy cuts reach slightly lower prices.
Rounds and squares = Rare in sizes over 8 mm.
Emerald cut = Rare and fetch premium prices because of the high quality of rough that has to be cut.

PHYSICAL PROPERTIES:6

Hardness = 9
Toughness = Excellent.
Cleavage = None.
Refractive Index = 1.762 – 1.770
Specific Gravity = 4.0

CLEANING METHODS:

Ultrasonic and Steamer = Safe for Sapphires of fine quality (fracture filled Sapphires have to be handled with special care).
Warm soapy water = Safe.

STABILITY:

Reaction to heat = Poor; may sometimes alter its color. Caution: Do not heat unheated Sapphires!
Reaction to chemicals = Boron.

MAJOR SOURCES:

Myanmar ( Burma), Sri Lanka ( Ceylon), Madagascar, Thailand, Cambodia, USA, Tanzania, Kenya, Australia, India, China. In the past: Kashmir.

BEST QUALITIES:

Unheated Sapphires from Mogok in Myanmar ( Burma) and from Kashmir.

STRONGEST PRICE JUMPS:

5 ct and 10 ct sizes.

ENHANCEMENTS:8

Mainly heated; also color diffused. The FTC requires complete disclosure and explanation of any treatment.

IMITATIONS:

Imitated by synthetics and other man-made imitation stones.

MOST RESEMBLING GEMSTONES:

Tanzanite and natural blue Spinel.

 

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