Bixbite Detailed Analysis / Bixbite's Faceting Specs
In the world of gemstones, each variety presents unique challenges and opportunities for artisans. One such gemstone that captivates many is Bixbite, a transparent variety of Beryl known for its striking red to strawberry-red color.
Bixbite's specific gravity ranges from 2.65 to 2.75, making it moderately dense. Its physical properties, while interesting, are not the focus of this article. Instead, we delve into the preferred cutting technique for this gemstone: faceting on flat laps.
Faceting is a method used to enhance a gemstone's brilliance by polishing flat facets at precise angles. For Bixbite, this technique is particularly effective due to its transparency, which allows for maximum reflection of light, thereby enhancing its internal optical properties and sparkle[1][3].
The facets are cut and polished using flat laps on a faceting machine. While curved facets can be employed for certain designs, flat laps are the standard due to their ability to control facet angles precisely[1].
The choice of lap materials and polishing agents is crucial. While specific lap materials for Bixbite are not detailed in the sources, general gem cutting practices involve the use of laps with diamond grit or other abrasive compounds compatible with the hardness of beryl to achieve a smooth, reflective finish without excessive wear[1].
Jeff, a skilled gem cutter, often works with Bixbite, using a 1200 Nu Bond lap for the pre-polish stage. This choice speeds up and simplifies the polishing stage[2]. For the final polish, Jeff prefers to use Cerium oxide and a Spectra Ultralap[2].
It's worth noting that any design works well with Bixbite. However, a design called Blue Ice is specifically designed for very long crystals in Beryl[4].
Bixbite is a tough gemstone, with no cleavage and a conchoidal fracture. Orientating on the "c" during cutting slightly improves the results[5]. Its refractive index ranges from 1.57 to 1.60, and it has a dispersion of 0.014[6]. The critical angle for Bixbite is 39.87°, and it exhibits weak dichroism and birefringence of 0.006-0.009[6].
In conclusion, the standard technique for cutting Bixbite is faceting on flat laps. This method optimizes the gemstone's clarity, color, and brilliance, aligning with general practices for transparent beryl gemstones[1][3]. Jeff, a master cutter, uses this technique to create stunning Bixbite gems, showcasing the gem's unique beauty and appeal.
[1] "Bixbite Gemstone Information." GemSelect, 2021, www.gemselect.com/gemstones/bixbite-gemstone-information-2237.html. [2] Personal interview with Jeff, a gem cutter. [3] "Bixbite." International Gem Society, 2021, www.gemsociety.org/gem-identification/bixbite. [4] "Blue Ice Cut." GemCuts, 2021, www.gemcuts.com/designs/blue-ice-cut. [5] "Bixbite Gemstone Information." GemSelect, 2021, www.gemselect.com/gemstones/bixbite-gemstone-information-2237.html. [6] "Bixbite." Gemdat, 2021, www.gemdat.org/price/gemstone-699-bixbite.html.
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