London-Blue Topaz Round Faceted Gemstones, AA-Grade

The saturated blue color, clarity and durability of this AA-grade round faceted London-blue topaz makes it a perfect choice for elegant custom jewelry designs of all types. One of the most popular topaz gemstones, London-blue topaz is a medium-to-deep grayish blue, sometimes with a green tinge—hues of the ocean depths. The gemstone is naturally flawless in most cases. Topaz is one of the birthstones for November. A hard, usually transparent aluminum silicate gem material, faceted topaz has a brilliance that rivals more expensive gemstones, making it an economical alternative to more costly gems. An "8" on the Mohs scale, topaz is tough and durable, ideal for all types of jewelry. Topaz forms in an orthorhombic structure with crystals that are usually prismatic. Pure topaz is colorless; impurities give the gemstone color. Gemstones can appear in a range of colors, with natural pink being the rarest. Most topaz colors are heat-treated or irradiated to enhance their color. In folklore, this gemstone is believed to dispel sadness and fear, to ward off poisons and to reverse infertility. Round-cut gemstones are highly popular and the most commonly available. Rio round gemstones are calibrated for size and hand inspected to ensure maximum attractiveness.

---

Gemstone type: Topaz
Stone shape: Round
Stone size: 5mm, 2mm, 3mm, 8mm, 4mm, 6mm
Stone type: Natural
Color: Intense Dark Blue
Birthstone: November
Enhancement: Heat-treated (H), Irradiated (R), Irradiated (R)
Grade: AA
Mohs hardness: 8
Clarity: Eye-clean
Refractive index: 1.609–1.637
Specific gravity: 3.53–3.56
Brand: AGTA
Cutting center: Thailand