| 100% | OPAL | 4 | The 17,000-carat Olympic Australis is the largest ever found |
| 56% | OPAL | 4 | The Olympic Australis is the largest one in the world |
| 55% | OPAL | 4 | The 17,000-carat Olympic Australis, e.g. |
| 55% | OPAL | 4 | Olympic Australis is the world's largest one |
| 54% | OPAL | 4 | The Olympic Australis is the world's largest discovered one |
| 53% | OPAL | 4 | Whitish gem such as the 17,000-carat Olympic Australis |
| 38% | MONETS | 6 | The largest collection of them is found in Paris's Musée Marmottan |
| 37% | SAMUELCHASE | 11 | Founding father who is the only Supreme Court justice to have ever been impeached |
| 37% | REPTILES | 8 | "Out of all the ___ to ever exist on Earth, 15a were the largest species..." |
| 37% | LUSITANIA | 9 | 1907 ocean liner that was (at the time) the largest ship ever made |
| 37% | NOBEL | 5 | Malala Yousafzai is the youngest person ever to win one (at age 17) |
| 36% | ALIBABA | 7 | E-commerce company whose I.P.O was the U.S.’s largest ever |
| 35% | PENINSULA | 9 | The arabian is the largest |
| 35% | DISCOVER | 8 | Be the first to find |
| 34% | OPAL | 4 | Olympic Australis is a noted one |
| 34% | LIZARD | 6 | The Komodo dragon is the largest |
| 34% | MEDAL | 5 | Olympic prize that 18-Across threw in the Ohio River (it was found in 2014) |
| 34% | PURSE | 5 | Where the endings of 17-, 33-, 43- and 63-Across are often found |
| 34% | HERBGARDEN | 10 | Where the first words of 17-, 26- and 47-Across may be found |
| 34% | USATODAYSECTION | 15 | One can be found at the starts of 17-, 29- and 45-Across |
| 34% | THEKROGER | 9 | American retail giant founded by businessman Barney, "___ Company" which is one of the largest supermarket chains: 2 wds. |
| 34% | SON | 3 | Cain was the first ever |
| 34% | ORGAN | 5 | Skin is the largest one |
| 33% | THEA | 4 | ___ Foss, who founded the largest tugboat company in the western US and who Tugboat Annie was loosely based on |
| 33% | AFTERLIFE | 9 | The great beyond ... or where each word in 17-, 24-, 35- and 45-Across might be found? |
| 33% | STANDAPART | 10 | Stick out from the crowd, and what can be found in 17-, 25-, 40-, and 50-Across? |
| 33% | MANTARAY | 8 | __ is the largest ray in the oceans |
| 33% | CROCODILE | 9 | Estuarine __ is the largest living reptile |
| 33% | OHIO | 4 | "Columbus is the largest city of ___." |
| 33% | DRAGON | 6 | The Komodo __ is the largest lizard in the world |