6.30 Ct. Quartz from Brazil

This pear shaped yellow quartz weighs 6.30 carat, and measures 14.46 by 10.55 by 8.26 millimeters, a profile that combines presence with wearable proportions. The gemstone is transparent, with a medium color intensity that reads as a warm lemon to soft golden yellow under natural daylight. The cutting style is a mixed brilliant cut, and the piece is evaluated as eye clean at typical viewing distance. Polish is excellent, and the piece is offered with no enhancement, coming from Brazil, a source renowned for producing clean crystalline quartz material. For reference, an opal type associated in our catalog is Fire Opal, noted here to clarify comparative optical behaviour and collecting categories within The Natural Gemstone Company inventory.

The mixed brilliant cut on this pear silhouette is executed to optimize both brilliance and scintillation, by marrying a faceted crown with a pavilion that uses modified brilliant geometry. The crown presents a compact table that balances light entry and return, while its star and kite facets are proportioned to foster even light dispersion across the face of the gem. The pavilion is cut with a series of main pavilion facets and smaller girdle return facets that promote multiple internal reflections before light exits, creating layered zones of brightness that animate when the stone is moved. The pointed tip of the pear is faceted with attention to symmetry, avoiding light leakage at the narrow end, and the overall facet junctions display tight alignment, which enhances angular contrast and visual depth. The excellent polish allows the facets to act as near perfect mirrors, reducing surface scatter and enabling crisp, high contrast flashes of white light and subtle yellow flashes related to the body color.

From an optical and material science perspective the way the mixed brilliant geometry interacts with quartz chemistry and refractive index is central to the gem experience. Natural rock crystal and its colored variants, including yellow quartz, have a refractive index in the range 1.544 to 1.553, and a low birefringence around 0.009, a combination that yields clean, singlet images and well defined reflections rather than doubled facets. Because pleochroism is negligible in quartz, the perceived color remains consistent as the stone is rotated, so the cutter can prioritize facet orientation for light performance rather than compensating for directional color. The medium color intensity permits higher internal contrast, so pavilion depth and crown angle choices were calibrated to maximize return without creating dark windowed zones. Clarity described as eye clean indicates the absence of inclusions large enough to interrupt internal light paths at normal viewing distances, which ensures that the mixed brilliant facet scheme produces uninterrupted light travel and consistent brilliance. The absence of enhancement confirms that color and clarity are natural, which collectors and technical buyers value for provenance and long term stability.

In practical design terms this 6.30 carat pear presents exceptional versatility for both custom jewelry and technical gem collections. The gem will exhibit pronounced face up brilliance in open head settings where the crown facets are unobstructed, and it will also show depth and contrast in gallery forward mounted settings where pavilion reflections can be observed. The subtle warm yellow is complementary to both warm and neutral metal palettes, and because the stone is unenhanced, setting choices that allow occasional cleaning and inspection will preserve its visual performance over time. For clients considering alternatives, the Fire Opal referenced in our catalog represents a distinct category with different internal light phenomena, such as vivid internal fire and play of color, whereas this Brazilian quartz delivers precise, mirror like facet reflections and stable body color. The Natural Gemstone Company stands behind the cutting and grading, and we can provide additional technical imagery, facet diagrams, and setting recommendations on request, to assist designers and connoisseurs in realizing the full optical potential of this pear shaped mixed brilliant yellow quartz.