Large bright natural blue topaz gemstone originating from Brazil. This weighs 21.70 CTS and has been cut and faceted into an emerald shape. The measurements are approximately 18.0 x 13.0 x 9.1 mm. The stone is of exceptional quality and displays higher grade optical effects. Brilliant flashes and sparkles are highly visible no matter which angle it's viewed upon. The coloring is an ultra bright sky blue and has been beautifully polished to a high sheen. This is a naturally earth mined gemstone and has been irradiated to enhance color. The gem is fully transparent and has excellent clarity. There is only a few slight natural variations found upon magnification. This would be considered eye clean or near flawless clarity. Check out our other topaz listings : https://www.etsy.com/ca/shop/PurityGems?ref=simple-shop-header-name&listing_id=1040414937§ion_id=31235305&sort_order=price_desc Check out our full storefront and selection : https://www.etsy.com/ca/shop/PurityGems The name " topaz" originates from the Greek word " topazion " , which is translated from the Sanskrit word for " fire". Topaz is an ancient stone, mentioned in the Christian Bible, and scientists believe it existed in prehistoric times. Topaz is a silicate mineral consisting of aluminum and fluorine, and is yellow to golden brown in color when its in its natural state. Different impurities can alter the coloring to such things tones as red or pink, and the use of irradiation to enhance the stone to a vibrant blue is quite popular. All photos are taken naturally without editing. There may be some variation in the color or resolution depending on the device used to view this listing. We do our best to provide an accurate representation of the product. More pictures and videos available upon request. Don't hesitate to contact me with any questions or concerns.