Pacific Jade was released in 2006, descended from Green Bullet breeding stock and developed to combine that older variety's bittering capability with a more distinctive, exportable aroma character — the result is a hop known specifically for a genuine black pepper note, a descriptor that shows up in relatively few other hops from any growing region worldwide.
Pacific Jade's 12-14% alpha acid is enough for a genuine bittering charge, contributing pepper and citrus notes that give it a spicier, more savory character than most of New Zealand's other tropical-fruit-forward exports. That pepper quality is specific enough that brewers who've worked with Pacific Jade tend to describe it as one of the more unusual, easily identifiable New Zealand hops in a blind tasting, distinct from the passion-fruit-and-citrus vocabulary most of the country's other releases share.
Pacific Jade's moderately high, genuinely dual-purpose alpha is inherited in part from Green Bullet — the IBU calculator will show what that inheritance actually contributes to a bittering charge. Green Bullet is the direct genetic relative and closest substitute, sharing some of Pacific Jade's earthy backbone without the specific pepper note. Southern Cross offers a related New Zealand alternative from a similar general era of breeding. New Zealand-style IPA and pale ale both use Pacific Jade where that peppery spice is wanted. Summit's alpha range runs well above Pacific Jade's own, while Southern Cross overlaps it closely, why Southern Cross is generally the better bittering match of the two listed substitutes.