Image 1 of 1 Opal Boulder 37.75 ct $1,500.00 38.53mm X 22.19mm Add To Cart Added! 38.53mm X 22.19mm You Might Also Like Opal Ethiopian 4.61 ct $697.00 Opal Koroit Boulder 1 $300.00 Opal Crystal 2.05 ct $338.00 Opal Doublet $1,600.00 Opal Doublet 7.75 ct $900.00