These are the folks who showed up for luxury from the very beginning—and have been there ever since. Congrats to these 10 brands on their impressive 20-show streak. 1. Necklace and brooch with 12.69 ct. natural black pear-shape diamond, 3.55 cts. t.w. pear-shape and 1.14 cts. t.w. round diamonds, and 1.65 cts. t.w. green emeralds in 18k white gold; $80,000; Rahaminov Diamonds; 213-622-9866; rahaminov.com  2. Altalena dangle earrings in 18k yellow gold with 8 mm–8.5 mm pearls and 0.3 ct. t.w. diamonds; $1,605; Mastoloni; 800-347-3275; mastoloni.com  3. Royal T engagement ring in 18k rose gold (also available in 18k yellow gold and platinum); $6,690 (without center stone); Tacori; 800-421-9844; tacori.com 4. Firenze Enamel 18k yellow gold vermeil diamond X bracelet in Florentine finish with 0.67 ct. t.w. diamonds; $6,500; Henderson Collection by Lecil; 800-605-3035; wlhlimite