The spelling of "brilliant pebble" is fairly straightforward when using IPA phonetic transcription. "Brilliant" is spelled /ˈbrɪliənt/, with the "ll" representing the "l" sound followed by a short "i". "Pebble" is spelled /ˈpɛbəl/, with the emphasis on the first syllable and the "e" pronounced as a short "e". When combined, the two words create a pleasing alliteration that can be easily remembered. "Brilliant pebble" is a great phrase to describe something small but shining brightly.
The term "brilliant pebble" does not have a specific etymology, as it is a combination of two separate words.
The word "brilliant" derives from the Latin word "brillare", meaning "to shine" or "to sparkle". It entered English in the late 17th century as an adjective to describe something shining brightly or remarkably intelligent.
On the other hand, "pebble" comes from the Old English word "pafl", which referred to a small, rounded stone. Over time, it became "pibel" in Middle English and eventually became "pebble" as we know it today.
When combined, "brilliant pebble" describes a pebble (a small, rounded stone) that sparkles or shines brightly.