20.66 Ct. Greenish Yellow (Lemon Quartz) Quartz from Brazil

One beautiful transparent 20.66 carat fancy shape greenish yellow lemon quartz, dimensions 21.40 x 15.30 x 12.00 mm, offers a compelling combination of notable weight and refined gemological characteristics that distinguish it within the market. At 20.66 carats this stone sits well above the typical size range for commercial quality quartz, and that substantial carat weight translates directly into rarity for a material that commonly appears in smaller, lower grade parcels. For educated buyers who value size as a primary driver of rarity and replacement cost, this piece presents a clear advantage. The weight not only enhances presence in a finished jewel, it also elevates the collectible appeal among connoisseurs who seek large, eye clean specimens that can be showcased as center stones or in bespoke designs without the need for clustering smaller gems to achieve visual impact.

From a grading perspective this lemon quartz offers attributes that align with higher tier colored gemstones, starting with an eye clean clarity grade as evaluated at eye level, which means that no inclusions are visible to the unaided eye under normal viewing conditions. Quartz commonly contains two phase inclusions, needles, or internal fractures, however this specimen exhibits none of those features to a degree that affects transparency or light transmission. The cutting style is faceted with a checkerboard pavilion and crown, a design choice that maximizes scintillation and dispersion for a gem with a refractive index in the range of 1.544 to 1.553, and that plays particularly well with the intense color intensity this stone displays. An excellent polish further enhances surface luster, so under both natural and artificial light the gem returns crisp, lively reflections and even color saturation across its fancy shape.

The origin Brazil is significant in assessing both provenance and comparative value, because Brazilian quartz deposits are among the most consistent sources of well formed, gem quality material in the market. Brazil has a long history of producing large, clean quartz crystals that respond predictably to standard heat treatments which are commonly applied to optimize tone and hue. This lemon quartz has been heat treated, a stable enhancement method widely accepted in trade, and when disclosed openly it does not carry the same negative connotations as more invasive or unstable treatments. Heat treatment in quartz is implemented to adjust and intensify color, and in this case the result is an intense greenish yellow tone that remains natural looking and durable. For a buyer who evaluates both natural origin and treatment history, the combination of Brazilian provenance, disclosed heat treatment, and documented physical measurements supports confident valuation and resale considerations.

For The Natural Gemstone Company this specimen embodies the blend of measurable characteristics that appeal to the discerning collector and the practical jeweler alike, because the 20.66 carat weight, fancy shape, and eye clean clarity provide immediate design flexibility. The gem is suitable for a wide range of settings, from a statement ring with protective bezel architecture to a bespoke pendant where the large surface area can be admired, and because quartz rates a seven on the Mohs hardness scale it balances durability with ease of fabrication. An educated buyer will value the transparent nature, checkerboard faceting, and excellent polish as items that reduce the need for post purchase enhancement or rework. For those seeking documentation we can facilitate independent testing and provide detailed images and measurements, so that the buyer has full information to assess cut quality, optical performance, and treatment disclosure prior to purchase, making this lemon quartz from Brazil an attractive, well substantiated acquisition from The Natural Gemstone Company.