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since 1989 All genuine Optima Gem products come with our certificate of quality and authenticity upon request. Optima Gem is a US based small business that has provided honest, accurately graded gemstones for over 30 years. Satisfaction Guaranteed. We are an Equal Opportunity Employer that promotes fair ethical business practices worldwide from the gem mine to your door. Our gems are calibrated for easy design for the artist and use in standard settings by the jeweler, goldsmith or silversmith. Need more quantity? Just ask. We limit availability to prevent being oversold. We offer volume discounts and free matching. We offer the following shipping options. Economy (usually FREE), First Class (Standard Rate), Priority (Standard Rate + $5), 2-day Air (Standard Rate + $20 US48), 1-day Air (Standard Rate + $30 US48). If the option you want is not displayed (eBay decides), message us before you order for assistance. In addition, even though eBay provides for a business day or more of handling time in their delivery estimates, we ship all 1-day and 2-day orders placed on a business day before 2pm cst on the same day. Order 1-day delivery any regular business day before 2pm cst, get it tomorrow! Detailed Product Description: Gem Species: CORUNDUM Hardness: 9 Density: 3.95 RI: 1.76We carefully select the rough to represent accurately its natural counterpart. These gems are created by the Flame Fusion process and have essentially the same physical properties as natural Sapphire. Fine Cut = Precision cut or visually imitates a precision cut. These stones have equal and symmetrical faceting with proper cutting angles (“critical angle’) and depth. Depth is between 60% and 70% of size listed. Size can vary +-0.1mm. 2-3mm (millimeter) gems are very small – less than 1/8 inch. AAA = eye clean, any inclusions will not be visible to the eye. Keep in mind that you are seeing much more in the photo than you can see with the naked eye, most times over 20x magnification. Dust, fingerprints and flash reflections are exaggerated in photographs. Smaller sizes will have progressively less color saturation than photo. If you are concerned about anything you see in our photos, contact us for more detail.