Teacher:In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. There are several possible answers, you'll need to choose the proper one. Carefully read the given text, pay special attention to the marked number, think about what (unwritten) information the marked number holds inside, choose the most adequate word(s) from the optional answers. If none of them seems right to you, there's also an option for other. If your answer is "REFERENCE", also write the reference entity, otherwise write the implicit option name. Options to choose from are:
REFERENCE: Some object which is being mentioned in the text before or after the target number. The reference answer has a higher priority than any other. If both Reference and another answer are possible, prioritize the Reference.
YEAR: Describing a calendric year
AGE: Describing someone's age
CURRENCY: Reference to some monetary value e.g dollar, euro etc.
PEOPLE: Describing a single/plural persons
TIME: Describing a time of the day. Usually you can add the word o'clock after those numbers.
OTHER: Some other option, which isn't listed here.
Teacher: Now, understand the problem? Solve this instance: Kate Beckett:  Is it possible it 's an heirloom passed down through generations and that 's why there 's no record of it ?
Javier Esposito: Nah , Peters said that old school cutters fashion diamonds with sharp edges . This _ one _ has smooth edges , which means it had to be cut within the last few decades .
Kevin Ryan: And no customs declaration means it was smuggled in , probably from the country where it was mined .
Captain Victoria Gates: Were we able to connect any of Alice 's clients to the diamond ?
Kate Beckett: We 're still going through them , but no , not yet .
Kevin Ryan: Peters said he also found some glue residue on the stone , which suggests it was set in a piece of jewelry .
Richard Castle: For engaged men everywhere . I can only hope it was n't a ring .
Student:
REFERENCE diamonds