Gorgeous Marquise Faceted Lab Created (Synthetic Corundum) Ruby These rubies are the same chemical compound as natural, mined from the earth, rubies! They will fit in most of our same sized calibrated settings Chemical composition: Al2O3 Crystal Structure: Hexagonal Purity: 99.99% Refractive Index: 1.717 Density: 3.98-4.1 g/cm3 Hardness Mohs: 9 Manufacturing Method: Verneuil, (Also called Flame Fusion)Be sure to add us to your favorites list!Check out our store for more diamonds, precious and semi-precious gemstones, completed jewelry pieces, tools and pre-notched settings priced BELOW wholesale!! Shipping & HandlingWE AUTOMATICALLY COMBINE ORDERS Please refer to the shipping tab, at the top of the listing, to calculate your shipping costs. US Shipping includes tracking. The winning bidder agrees to comply with eBay policy.Non-paying bidders will be reported and registered with the eBay non-paying bidder program. Payment is to be made within 5 days. Your items are mailed in a sturdy bubble wrap. You can combine as many items as you want, for up to 5 days, from your initial purchase. We ship our gems and settings every business day. If you are not happy with your purchase please contact us before leaving feedback.We work very hard to make sure you are satisfied; each time you purchase from us! International Buyers – Please Note:Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility.Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.