Genuine Ruby Round Circle 925 Sterling Silver Pendant Designer 925 18" Necklace

Genuine Ruby Round Circle 925 Sterling Silver Pendant Designer 925 18 inch chain Necklace Beautiful ruby necklace. The chain is marked 925Y. Yaffa & Sons? The circle pendent is marked 925 OTC which is OTC International. I can't read the other mark. Great pre-owned condition. Thanks for looking!