Cryptic crossword clue
Coral and gemstone possibly seen as types of rock 13

The most common and most likely answer to this crossword clue is the 13 letter word CONGLOMERATES

I've seen this crossword clue in The Daily Telegraph
C
O
N
G
L
O
M
E
R
A
T
E
S

Buddy explains!

The straight part
We know that "types of rock" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case types of rock = conglomerates.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does CONGLOMERATES mean?

CONGLOMERATES noun
  1. A cluster of heterogeneous things.
  2. A corporation formed by the combination of several smaller corporations whose activities are unrelated to the corporation's primary activity.
  3. A rock consisting of gravel or pebbles embedded in a matrix.

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