13.59 Ct. Greenish Blue Quartz from Brazil

One exquisite gem that stands apart in both presence and provenance is this 13.59 carat oval greenish blue quartz, a finely faceted statement stone that combines an impressive physical scale with refined lapidary work. Measuring 18.31 x 13.47 x 8.76 mm, the oval proportions offer a flattering spread on the finger, creating a strong visual impact without overwhelming the wearability of the piece. The cutting style is faceted, executed with a mixed brilliant cut design that balances facet arrangement for strong scintillation and lively light return, while retaining a pleasing depth and body that shows the greenish blue hue at a glance. With an excellent polish throughout, the surface finishes are clean and bright, allowing the stone to exhibit maximum brilliance under ambient light. The weight and dimensions together make this stone ideal for a center, offering a substantial look that remains elegant and wearable.

When evaluating the gemstone quality for an informed buyer, clarity and treatment are two of the most important considerations. This quartz has a clarity grade of very slightly included, evaluated at eye level, which means that under normal viewing conditions the stone appears clean and free of distracting inclusions, while slight internal features are present under magnification or close inspection. These minor inclusions do not detract from the overall beauty of the gem, and in many cases they help to authenticate natural origin. The color intensity is light, a quality that gives the greenish blue tone a delicate, sophisticated appearance rather than a strong, saturated color. The gem has been heat treated, a standard and stable enhancement in quartz that is widely accepted in the trade, used to refine and stabilize color, and it is permanent under normal wearing and cleaning conditions. The gem originates from Brazil, a well known source for high quality quartz, which lends additional confidence in its geological provenance and typical quality characteristics such as good clarity and stable coloration.

Beyond the specifications, it is important to consider the practical aspects of wearing this stone as an engagement gem. Quartz has a Mohs hardness of 7, which provides good resistance to everyday scratching, and the specific gravity near 2.65 gives the stone a comfortable heft on the hand that reads as substantial without being cumbersome. For long term daily wear, we recommend thoughtful setting choices that balance beauty with protection, such as a bezel or partial bezel for maximum security, a halo setting to frame and protect the stone while amplifying perceived size and sparkle, or a low profile prong setting with protective shoulder designs to reduce exposure to knocks. The oval shape naturally elongates the appearance of the finger, and the mixed brilliant cut enhances scintillation, making it a lively and flattering choice for those who want a colored center stone with sparkle comparable to more traditional gemstones. The heat treatment used to enhance color is robust, so normal cleaning with warm soapy water and a soft brush is safe, and professional occasional checkups for settings are recommended to maintain security.

At The Natural Gemstone Company we prioritize transparency and education, and this greenish blue 13.59 carat quartz embodies the qualities we seek when selecting engagement gems, a balance of aesthetic appeal, reliable durability, and clear grading information. We provide detailed imagery and precise measurements, and we are happy to discuss mounting options and setting recommendations to ensure the stone performs beautifully as an everyday engagement piece. For an educated buyer seeking an ethical, well documented alternative to traditional choices, this Brazilian quartz offers notable size, pleasing color, excellent polish, and a clarity that reads clean to the eye, all supported by the expertise and service of The Natural Gemstone Company. If you would like additional details about setting compatibility, care instructions, certification options, or ring design ideas to showcase this oval mixed brilliant gem as the centerpiece of an engagement ring, we are ready to assist you with tailored advice and professional guidance.