Natural London Blue Topaz 5.78Ct – cushion Mixed Cut loose london topaz
| Gem Name | London blue topaz |
| Product Code | ATLBT |
| Weight (carats) | 5.78ct |
| Dimensions (mm) | 9.8x12x6.1mm |
| Shape | cushion mixed cut |
| Cut | faceted |
| Color | deep blue |
| Clarity | VVS |
| Origin | |
| Treatment | irradiated |
| Hardness (Mohs) | 8 |
| Certificate | None |
| Price | 10$/ct |
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Natural London Blue Topaz 5.78Ct – Cushion Mixed Cut Loose London Topaz
Product Code: ATLBT
Status: In Stock
Status: In Stock
There is a specific hue of blue that sits right at the intersection of sophistication and mystery. It isn’t the bright sky blue of a summer day; it is the deep, velvety indigo of the ocean at twilight. This is the signature of the Natural London Blue Topaz 5.78Ct, a gemstone that offers the grandeur of high-carat luxury without the prohibitive price point of Sapphire.
At Wikigemia, we prioritize transparency and optical brilliance. This specific cushion Mixed Cut loose london topaz has been selected for its exceptional VVS clarity and its “face-up” size, making it a perfect candidate for custom fine jewelry.
Visual Dynamics: The Cushion Mixed Cut
When buying loose gemstones online, the “Cut” is often more important than the weight. This 5.78-carat specimen features a Cushion Mixed Cut.
Why does this matter? A standard cushion cut offers a vintage, pillow-like silhouette with soft, rounded corners. However, by applying a “mixed cut” technique—combining a brilliant-cut pavilion (the bottom) with a step-cut or modified crown (the top)—we achieve two things simultaneously:
- Retention of Color: The depth of the cut intensifies the inky, petrol-blue saturation.
- Scintillation: It maximizes light return, preventing the stone from looking “sleepy” or too dark in low light.
With dimensions of 9.8 x 12 x 6.1mm, this gem has significant surface area. It is substantial enough to serve as the centerpiece of a statement cocktail ring or a bold pendant.
Gemological Analysis & “Information Gain”
To make an informed decision, you need to understand the technical architecture of this stone.
Color & Saturation
This specimen exhibits the classic “London Blue” tone—the darkest and most valuable variety of Topaz. It possesses a dark gray to green undertone that gives it a steely, masculine edge, distinct from lighter varieties.
Clarity (VVS)
“Very, Very Slightly Included.” To the naked eye, this stone is flawless. Even under 10x magnification, inclusions are difficult to spot. In a stone nearly 6 carats, this cleanliness is rare.
Durability: Topaz has a hardness of 8 on the Mohs scale. For context, it is harder than Quartz/Amethyst and Tanzanite. This makes it durable enough for daily wear.
Investment Perspective & Design
At a total price of $60 (approx. $10 per carat), this stone represents an anomaly in the market. Usually, stones with VVS clarity and this depth of color command higher premiums. For buyers comparing this to Aquamarine, the London Blue Topaz offers a similar “precious” aesthetic at a fraction of the cost.
Design Inspiration:
- The Halo: Surround it with small white Zircons or diamonds to create a dramatic contrast.
- Vintage Gold: Rose gold settings create a stunning warm-cool contrast against London Blue.
| Attribute | Detail |
|---|---|
| Gem Name | London Blue Topaz (Natural) |
| Weight | 5.78 ct |
| Dimensions | 9.8 x 12 x 6.1 mm |
| Shape & Cut | Cushion Mixed Cut (Faceted) |
| Color | Deep Blue |
| Clarity | VVS |
| Hardness | 8 (Mohs Scale) |
| Treatment | Irradiated (Industry Standard) |
| Price | $60 Total ($10/ct) |
Frequently Asked Questions
Is London Blue Topaz a natural gemstone?
Yes, the gemstone material is natural Topaz earth-mined. However, the specific “London Blue” color is achieved through standard irradiation treatment which mimics earth’s radiation to deepen the color permanently.
Is this Cushion Mixed Cut suitable for an engagement ring?
Absolutely. With a hardness of 8, Topaz is durable. The 5.78ct size is substantial, and the deep blue color offers a unique, non-traditional alternative to diamonds or Spinel.
How does the color compare to Sapphire?
London Blue Topaz is generally darker and has a slight teal/inky undertone compared to the pure royal blue of Sapphire. It offers much higher clarity (cleanliness) at a fraction of the price of a similarly sized Sapphire.
What does “Mixed Cut” mean?
A mixed cut combines different cutting styles—typically a brilliant cut on the bottom (pavilion) for sparkle, and a step cut or modified brilliant on top (crown) to preserve weight and color depth. It gives the stone a lively appearance.
Ready to secure this gem?
Unique stones of this clarity and cut do not stay in stock long. We guarantee the specs listed match the stone you receive.
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