Synthetic Ruby, is corundum, and practically the same as natural Ruby gemstone: apart from the price! The Celtic knots in our sterling silver rings are taken from Ireland’s national treasure; the book of Kells Silvershake 8X6mm Simulated Oval Shape Red Ruby 14K Yellow Gold Plated 925 Sterling Silver Celtic Knot Weave Solitaire Ring July Gemstone Birthstone; is shipped to you in anti-tarnish protection inside reinforced gift boxes with satin-style pouches; guaranteed beyond competitors Birthstone of July, Ruby is also very expensive, but can be substituted by Synthetic Ruby; an affordable alternative Silvershake 8X6mm Simulated Oval Shape Red Ruby 14K Yellow Gold Plated 925 Sterling Silver Celtic Knot Weave Solitaire Ring July Gemstone Birthstone Size 7