Buying a loose gemstone gives you independence, you get the freedom to make your own choice, your own jewelry design.
A natural 0.64 carat blue sapphire in a round cut, from Sri Lanka (Ceylon), heat treated. At approximately 5mm in diameter, this round Ceylon blue sapphire is a calibrated format — the 5mm size fits a standard range of round settings in earring, pendant, and ring applications without custom fabrication. Ceylon origin adds the documented quality associated with Sri Lanka's fine sapphire production, and the round brilliant cut delivers the most vivid blue display for this carat weight.
Why Choose this 0.64 ct Round Ceylon Blue Sapphire?
Ceylon blue sapphire at 0.64 carats in a calibrated round is the most practical format for earring center stones and small pendant solitaires that require a vivid blue sapphire with documented origin. The round cut maximizes color display for the weight, and the ~5mm calibrated diameter eliminates the sizing and fitting steps that uncalibrated stones require in production.
Key Benefits of this Natural Blue Sapphire
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Ceylon Origin
Sri Lanka — the benchmark source for vivid blue sapphire at the commercial level.
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Calibrated ~5mm Format
Consistent diameter for drop-in use in standard round solitaire earring and pendant settings.
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Round Brilliant Maximum Sparkle
Maximum light return for this carat weight — vivid Ceylon blue face-up.
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Earring and Pendant Scale
0.64 carats — the right weight for earring center stones and small pendant solitaires.
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Durable for Daily Wear
Corundum at Mohs 9, second only to diamond.
Features
- Carat Weight: 0.64 Carats
- Gem Type: Natural Blue Sapphire
- Cut: Round (approximately 5mm)
- Origin: Sri Lanka (Ceylon)
- Treatment: Heat Treated
- Color: Blue
- Clarity: Eye-clean — no visible inclusions under normal viewing
- Hardness: 9 on the Mohs scale
This 0.64 ct round Ceylon blue sapphire has been hand-selected for the vividness of its blue — the quality that delivers consistent Ceylon character in earring and pendant applications.
Why Customers Love This Gemstone
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Ceylon Blue Quality: The benchmark blue at an earring-friendly weight.
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Calibrated Round: Fits standard ~5mm settings without adjustment.
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Daily Wear Durability: Mohs 9 — appropriate for all jewelry types.
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Trusted Source: Ceylon origin confirmed, treatment disclosed honestly.
Owning this 0.64 ct round Ceylon blue sapphire means choosing the most recognized sapphire quality in a calibrated earring and pendant format.
Perfect Uses for this 0.64 ct Blue Sapphire
- Solitaire stud earrings (pair)
- Small pendant solitaire
- Three-stone ring center stone
- September birthstone jewelry
- Accent stone in custom multi-stone design
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