Black Square Coin - 3mm - Gilson Opals (0) No Reviews yet Pinit SKU: GLOSQUARECOIN_BLACK_3MM $2.65 / Piece Quantity discounts available PiecePrice Quantity -+ Add to Cart Details Our 3mm square coin opals are are flat & polished on both side and the edges are rounded and polished. These stones are perfect for geometric patterns... DetailsApplyDetailsOur 3mm square coin opals are are flat & polished on both side and the edges are rounded and polished. These stones are perfect for geometric patterns.Sold by the piece.See MoreSee Less Reviews 0 ApplyRatings & ReviewsNo reviews availableBe the first to Write a Review