CMLL held a Forjando un Ídolo (Spanish for "Forgin an idol") tournament in April and May 2011, with the purpose of identifying which of the 16 "Rookies" in the tournament would move up the ranks of the promotion. The tournament consisted of two rounds, first a round-robin group round, with the top 2 in each of the four groups competing in an elimination tournament. Diamante won his block by defeating all three opponents (Hijo del Signo, Hombre Bala Jr., Puma King), advancing to the second round. Diamante lost in the first match of the second round to Fuego and was eliminated from the tournament. Afterwards CMLL kept the Forjando un Ídolo concept going with a four team Trios tournament called Forjando un Ídolo: La Guerra Continúa (Forging an Idol: The War Continues"), which saw the coach of each group team up with the two finalist for the groups. Diamante and Hijo del Signo teamed up with Negro Casas (called Grupo Bravo) and made it all the way to the finals, only to lose to Grupo Charly (Atlantis, Guerrero Maya, Jr. and Delta). Being a reigning CMLL Champion, Diamante was one of 16 champions who competed for the 2011 CMLL Universal Championship in September 2011. Diamante defeated Pólvora in the first round, but lost to La Sombra in the second. Diamante, Ángel de Oro and Rush's Mexican National Trios reign came to an end after 254 days, when Los Invasores (Olímpico, Psicosis and Volador Jr.) defeated them for the championship. Diamante entered the 2011 Torneo Gran Alternativa, teaming up with La Sombra again, the first team to enter two years in a row. In the first round they defeated Atlantis and Fuego, in the second round they defeated Hijo del Signo and Mr. Niebla, before losing to eventual tournament winners Escorpión and Último Guerrero in the semi final match. He also appeared on the CMLL 78th Anniversary Show, CMLL's biggest show of the year, in an unsuccessful bid to win the 2011 Leyenda de Plata ("Silver Legend") tournament. Diamante made his first trip to Japan in January, 2012 appearing on two jointly promoted shows between CMLL and Japanese based New Japan Pro Wrestling (NJPW) called Fantastica Mania. On the first night Diamante teamed up with Japanese natives Jushin Thunder Liger and Tetsuya Naito defeated Mephisto, Shinsuke Nakamura, Yujiro Takahashi. On the second night Diamante, Hiroshi Tanahashi and Naito lost to Mephisto, Takahashi and Kazuchika Okada. In March 2012 CMLL repackaged Metro, giving him a new blue and white mask & outfit and changing his name to "Diamante Azul", which led to some confusion since CMLL already had a wrestler using the ring name "Diamante" on their roster. After being unsuccessful in the Forjando un Ídolo tournament in 2011, Diamanted entered CMLL's En Busca de un Ídolo ("In search of an Idol") in early 2012, a tournament with a similar concept, this time with eight wrestlers contending for the trophy. Diamante qualified for the second round of the tournament with three wins and one loss. The second round was less successful for Diamante as he ended last, with two losses, but the major development took place in his last tournament match where he debut a new mask and trunk design, a silver and black scheme very reminiscent of Lucha libre legends El Santo and El Hijo del Santo and Axxel, one of El Santo's grandsons. Diamante participated in the 2012 Leyenda de Azul tournament, but was outlasted by tournament winner Diamante Azul. On July 12, 2012 Diamante and Misterioso, Jr. were the last two survivors in a torneo cibernetico, qualifying for a match for the vacant Occidente Heavyweight Championship. The following week Diamante defeated Misterioso, Jr. to win his first singles championship. Diamante held the title for just under two months, losing it to Olímpico on September 18, 2012. In January 2013, Diamante returned to Japan to take part in the three-day Fantastica Mania 2013 event. During the first night on January 18, he teamed with Bushi and Ryusuke Taguchi in a six-man tag team match, where they were defeated by Rey Escorpión, Tomohiro Ishii and Yujiro Takahashi. The following night, Diamante and Máscara Dorada were defeated in a tag team match by Mephisto and Okumura. During the third and final night, Diamante took part in a twelve-man torneo cibernetico, from which he was the sixth man eliminated by Okumura and which was eventually won by Tomohiro Ishii. Diamante was one of 16 wrestlers to compete for a spot in the finale of the 2013 Reyes del Aire tournament in a torneo cibernetico elimination match. He was the seventh math eliminated as he was pinned by Niebla Roja. By the end of 2013 Diamante stopped working for CMLL, either in general or under that name.