Quartz Gemstone

The certificate shown appears to state:

• Laboratory: Gem Report Antwerp
• Report number: 1830016198 AN
• Date: 26 February 2026
• Stone: Natural Quartz (Rock Crystal)
• Cut: Emerald Step Cut
• Measurements: 15.97 × 11.09 × 7.61 mm
• Weight: 10.00 ct
• Transparency: Transparent
• Color: Colorless
• Treatment: No indications of treatment

Based on the image, the stone is a large, colorless rock crystal quartz fashioned in an emerald step cut. Rock crystal is the colorless variety of quartz and is a common gemstone material. While a 10 ct weight sounds substantial, quartz is abundant and generally commands a much lower market value than diamond, sapphire, emerald, or other precious gemstones of similar size.
The report appears to be an identification report rather than a high-value gemstone grading report. Its primary function is to confirm that the stone is natural colorless quartz and untreated.
If your goal is valuation, I can estimate a realistic wholesale, auction, or retail value range for this 10.00 ct natural rock crystal quartz based on the certificate and dimensions.

Exceptional 10.00 carat Natural Rock Crystal Quartz presented with an independent Gem Report Antwerp certificate confirming natural origin and no indications of treatment. This impressive gemstone displays outstanding transparency and a crisp colorless appearance, showcasing the pure beauty for which high-quality rock crystal quartz is prized by collectors, gem enthusiasts, designers, and lapidary specialists.
Expertly fashioned in an elegant Emerald Step Cut, the stone exhibits precise geometric facets that create a sophisticated hall-of-mirrors effect while emphasizing its remarkable clarity and brilliance. Measuring 15.97 x 11.09 x 7.61 mm, this substantial gemstone offers impressive face-up dimensions, making it ideal for statement jewelry creations including rings, pendants, brooches, or bespoke collector pieces.
Rock crystal, the transparent and colorless variety of natural quartz, has been admired throughout history for its purity and crystal-clear appearance. Fine specimens are sought after for custom jewelry projects, mineral collections, gemstone displays, and artisan craftsmanship. The clean, versatile appearance complements both contemporary and classic jewelry designs, pairing effortlessly with precious metals such as gold, platinum, and silver.
Accompanied by Gem Report Antwerp certificate number 1830016198 AN, dated 26 February 2026, confirming Natural Quartz (Rock Crystal), Emerald Step Cut, transparent appearance, colorless body color, and absence of detected treatments. The gemstone is securely sealed within its original certification holder for integrity and preservation.
An attractive certified natural gemstone suitable for gemstone collectors, jewelry manufacturers, gem investors seeking certified specimens, crystal enthusiasts, and anyone appreciating the timeless elegance of natural colorless quartz. The combination of substantial 10.00 carat weight, elegant emerald cut, transparent crystal structure, and independent certification makes this a desirable addition to any gemstone collection.