TREND GAME Ebony and Ivory Black and white is the combo that won’t quit in fashion and in diamond jewelry. Not only are black and white gems a timeless duo that can punch up a day or night ensemble, they work in classic, modern, and whimsical designs. Is it any wonder that the pairing is a perennial favorite in new collections nationwide?  Top: Ring in 18k gold with 0.82 ct. t.w. black diamonds and 0.2 ct. t.w. colorless diamonds, $2,795, Alor, San Diego, 800-872-0172, alor.com; Caren necklace in 18k gold with 0.3 ct. t.w. colorless and black diamonds, $2,145, Melissa Kaye, NYC, 917-573-0388, melissakayejewelry.com; right: Bo Bo ear studs in 18k white gold with 0.27 ct. t.w. diamonds, $1,430, Qeelin at the Anima Group, NYC, 800-868-5532, qeelin.com   HOT STOCK TIP License to Drill