RAPAPORT... Sotheby's April Hong Kong auction will feature more than $93.6million-worth of jewels, among them a step-cut, 14.18-carat, fancy blue,VVS2-clarity diamond ring.That lot, with a surround of pink diamonds, carries an estimated price of $6 million to $7.7 million, the auction house said Tuesday. Also included at the event is a Van Cleef & Arpels gem-setand diamond bracelet valued at $845,000 to $1.1 million, and a 25-carat Burmeseruby and diamond ring priced between $10.5 million and $11.8 million. The Magnificent Jewels and Jadeite Spring Sale on April 3 willalso feature classic period jewels mixed with contemporary creations, includinga rare Art Deco Egyptian revival bracelet by Van Cleef & Arpels. The auction will take place at the Hong Kong Convention andExhibition Centre.