Yn hafan hyfryd Gardd Fotaneg Genedlaethol Cymru, roedd trysor cudd yn yr awyr.

In the lovely haven of the Gardd Fotaneg Genedlaethol Cymru (National Botanic Garden of Wales), there was a hidden treasure in the air.

Roedd y coed yn gwisgo eu gorau hydrefol, dail cochion, oren, a melyn yn dawnsio yn y gwynt.

The trees were wearing their best autumn attire, red, orange, and yellow leaves dancing in the wind.

Dail oedd fel lliwiau gwinllannoedd, lleoliad perffaith ar gyfer cynllun arbennig Gareth.

Leaves were like the colors of vineyards, a perfect setting for Gareth's special plan.

Roedd Gareth yn edrych am yr amser iawn.

Gareth was looking for the right moment.

Roedd yn bryderus, ei galon yn curo fel drymiau, ond ei gilydd-dymuniad i gynnig priodas i Eira yn drech.

He was anxious, his heart beating like drums, but his desire to propose marriage to Eira was stronger.

Roedd Eira'n bwyllog, yn teimlo bod rhywbeth arbennig yn digwydd heddiw.

Eira was calm, sensing that something special was happening today.

Roedd hi wedi sylwi bod Gareth yn rhemp.

She had noticed Gareth was nervous.

"Mae wrth fy modd yma," meddai Eira, gan edrych dros y pwll koi, ei llonyddwch yn gwbwl cyferbyniol i bryder Gareth.

"I love it here," said Eira, looking over the koi pond, her tranquility in complete contrast to Gareth's anxiety.

Dyma pryd y penderfynodd Gareth bod y foment wedi cyrraedd.

That's when Gareth decided the moment had arrived.

Ewyllysiodd ar lawr ei boced, ond yna, disodlodd ar y cerigosl.

He wished into his pocket, but then he stumbled on the pebbles.

A diflannodd y fodrwy yn y dŵr fel mellt.

The ring disappeared into the water like lightning.

Daeth panig ar Gareth.

Panic struck Gareth.

Dyma oedd ei eiliad, a nawr – problem!

This was his moment, and now – a problem!

Gan edrych dros Eira, nad oedd hyd yma wedi gweld, dechreuodd meddwl, a yw’n gyfaddef neu’n datrys?

Looking over at Eira, who hadn't noticed yet, he started to wonder, should he confess or solve it?

Gyda chalon dewr, Gareth penderfynodd ymdrechu dros ei gariad.

With a brave heart, Gareth decided to endeavor for his love.

Heb feddwl ddwywaith, neidiodd i'r pwll.

Without thinking twice, he jumped into the pond.

Roedd dŵr oer fel sioc, a'r bobl yn dechrau heidio o gwmpas.

The cold water was a shock, and people began crowding around.

Roedd Eira, yn syn, ond wedyn yn gwenu, gan weld penderfyniad Gareth.

Eira, surprised at first, then smiled, seeing Gareth's determination.

Plymiodd, wrth chwilio trwy'r wyneb symudliw o ddŵr a'r koi hyfryd yn pelliwio o gwmpas.

He dived, searching through the shimmering surface of water and the lovely koi swimming around.

Dyma fo, y fodrwy - yn disgleirio fel seren.

There it was, the ring—shining like a star.

Roedd Gareth yn deimlo dŵr trwy ei heligaeth ddillad, ond bodlonrwydd yn llenwi'i galon.

Gareth felt water through his soaked clothes, but satisfaction filled his heart.

"Dwi'n gwybod nad oedd hyn yn berffaith..." dechreuodd Gareth, ei lais yn crynu, ond roedd Eira eisoes yn chwerthin, yr hapusrwydd yn hedfan o'i llygaid.

"I know this wasn't perfect..." Gareth began, his voice trembling, but Eira was already laughing, happiness radiating from her eyes.

"Mae'n berffaith, Gareth," meddai Eira, gan roi'i llaw i'w law fo.

"It's perfect, Gareth," said Eira, reaching out her hand to his.

A'i gesglud o'r dŵr, roedd Gareth yn gwybod bod niw y rhwystredigaethau'n gwneud y foment yn gofiadwy.

As he was pulled from the water, Gareth knew that the mishaps had made the moment memorable.

Yn y pen draw, roedd y dŵr yn treiddio i'r dydd, ond roedd y stori don hyn o gariad yn creu gwres yn eu calonnau.

In the end, the water soaked into the day, but this sweet tale of love warmed their hearts.

Roedd calonnog o Gareth wedi newid; a thu hwnt i bryder, roedd canfod cysur yn diurdra.

The courage of Gareth had transformed; beyond anxiety, he found comfort in his boldness.

Ymhellach i'r stori, roedd yr hydref wedi'i selio'n bythol gyda chytundeb priodas calonog y dau.

Beyond their story, the autumn was eternally sealed with the heartfelt marriage agreement between the two.