Blue Nile – the online diamond retailer has announced ‘Holiday Exclusives’ deals – for Black Friday. This is its first such. The offering includes sterling silver everlasting hearts necklaces, listed at $35 (usually this is listed at $65); a tuxedo, freshwater cultured pearl necklace listed for $100 (normally this is listed for $185); a 15-carat (total weight) oval design diamond necklace listed for $18,850 ( original listing price $29,000). The promotion will be valid for 24 hours on November 26, or until supplies runs out.