Burmese Sapphire
Mogok sapphire characteristics, inclusions, and market position relative to Kashmir and Ceylon.
Introduction
Mogok produces sapphire alongside its celebrated ruby, drawing from the same marble-hosted, low-iron geological environment. Though commercially overshadowed by the ruby trade, Burmese sapphires occupy a premium second tier, valued below the historic Kashmir benchmarks but above most other sources for comparable quality.
Diagnostic significance mirrors the ruby profile. The low iron content of Mogok marble allows trace chromium to produce a measurable red fluorescence response under long-wave UV, stronger than typical Ceylon sapphire and far stronger than iron-rich Thai or Australian material. [1] The characteristic royal blue, medium to medium-dark tone with slight violet modifier, combined with short rutile silk, calcite, apatite, zircon, and angular colour zoning, aligns with the Mogok inclusion suite shared with Burmese ruby.
Origin certification from a recognised laboratory is strongly recommended: the Burmese premium over Ceylon for fine unheated material can reach 30–80%. Ethical- sourcing considerations mean some buyers specifically seek or avoid this origin depending on jurisdiction and policy. [2]
Characteristics
What defines Mogok sapphire:
Colour
- Ideal: Royal blue; vivid saturation
- Tone: Medium to medium-dark
- Modifier: Pure blue or slight violet
- Character: Rich, saturated colour
Optical Properties
- Fluorescence: Often more than Ceylon
- UV response: Red fluorescence from trace chromium [1]
- Lustre: Excellent in fine stones
- Silk: Variable; contributes to character
Quality Range
- Clarity: Variable; can be very clean
- Fine stones: Exceptional colour and clarity
- Commercial: Good quality widely available
- Treatment: Both heated and unheated in market
Inclusions
Market Position
Burmese sapphire in the hierarchy:
Value Ranking
- Kashmir: Highest (historic, extremely rare) [2]
- Burma: Second tier (premium source)
- Ceylon: Third tier (fine quality, better availability)
- Madagascar/other: Fourth tier (good value)
Premium Factors
- Vivid colour commands premium
- Unheated material more valuable
- Larger sizes increasingly rare
- Origin certification recommended
Comparison
Burmese Sapphire
- Royal blue colour
- Good fluorescence
- Premium pricing
- Limited supply
- Ethical concerns for some buyers
Ceylon Sapphire
- Lighter, brighter blue
- Excellent brilliance
- Better availability
- Wide quality range
- Generally preferred ethically
Treatment
Enhancement considerations:
- Heat treatment: Common in market
- Purpose: Improves colour, dissolves silk
- Unheated premium: Significant for fine stones
- Disclosure: Required; check certificates
- Laboratory reports: Recommended for purchases
Fancy Colour Sapphires
Beyond blue, Mogok produces:
- Pink sapphire: Good quality available
- Yellow sapphire: Limited but fine material
- Padparadscha-type: Rare pink-orange
- Star sapphire: Six-rayed asterism
- Colour-change: Some exceptional examples
References
- ↑ 1. Palke, A.; Renfro, N.; Berg, R. (2019). Geographic Origin Determination of Blue Sapphire. Gems & Gemology, 55(4), 536–579. DOI: 10.5741/gems.55.4.536.
- ↑ 2. Hughes, R. (2017). Ruby & Sapphire: A Gemologist's Guide. RWH Publishing. ISBN: 978-0-9645097-6-4.